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-rw-r--r--crates/hir_ty/src/tests/coercion.rs861
-rw-r--r--crates/hir_ty/src/tests/display_source_code.rs41
-rw-r--r--crates/hir_ty/src/tests/macros.rs787
-rw-r--r--crates/hir_ty/src/tests/method_resolution.rs1053
-rw-r--r--crates/hir_ty/src/tests/never_type.rs409
-rw-r--r--crates/hir_ty/src/tests/patterns.rs656
-rw-r--r--crates/hir_ty/src/tests/regression.rs842
-rw-r--r--crates/hir_ty/src/tests/simple.rs2218
-rw-r--r--crates/hir_ty/src/tests/traits.rs3113
9 files changed, 9980 insertions, 0 deletions
diff --git a/crates/hir_ty/src/tests/coercion.rs b/crates/hir_ty/src/tests/coercion.rs
new file mode 100644
index 000000000..7bc6c79f3
--- /dev/null
+++ b/crates/hir_ty/src/tests/coercion.rs
@@ -0,0 +1,861 @@
1use expect_test::expect;
2use test_utils::mark;
3
4use super::{check_infer, check_infer_with_mismatches};
5
6#[test]
7fn infer_block_expr_type_mismatch() {
8 check_infer(
9 r"
10 fn test() {
11 let a: i32 = { 1i64 };
12 }
13 ",
14 expect![[r"
15 10..40 '{ ...4 }; }': ()
16 20..21 'a': i32
17 29..37 '{ 1i64 }': i64
18 31..35 '1i64': i64
19 "]],
20 );
21}
22
23#[test]
24fn coerce_places() {
25 check_infer(
26 r#"
27 struct S<T> { a: T }
28
29 fn f<T>(_: &[T]) -> T { loop {} }
30 fn g<T>(_: S<&[T]>) -> T { loop {} }
31
32 fn gen<T>() -> *mut [T; 2] { loop {} }
33 fn test1<U>() -> *mut [U] {
34 gen()
35 }
36
37 fn test2() {
38 let arr: &[u8; 1] = &[1];
39
40 let a: &[_] = arr;
41 let b = f(arr);
42 let c: &[_] = { arr };
43 let d = g(S { a: arr });
44 let e: [&[_]; 1] = [arr];
45 let f: [&[_]; 2] = [arr; 2];
46 let g: (&[_], &[_]) = (arr, arr);
47 }
48
49 #[lang = "sized"]
50 pub trait Sized {}
51 #[lang = "unsize"]
52 pub trait Unsize<T: ?Sized> {}
53 #[lang = "coerce_unsized"]
54 pub trait CoerceUnsized<T> {}
55
56 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
57 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
58 "#,
59 expect![[r"
60 30..31 '_': &[T]
61 44..55 '{ loop {} }': T
62 46..53 'loop {}': !
63 51..53 '{}': ()
64 64..65 '_': S<&[T]>
65 81..92 '{ loop {} }': T
66 83..90 'loop {}': !
67 88..90 '{}': ()
68 121..132 '{ loop {} }': *mut [T; _]
69 123..130 'loop {}': !
70 128..130 '{}': ()
71 159..172 '{ gen() }': *mut [U]
72 165..168 'gen': fn gen<U>() -> *mut [U; _]
73 165..170 'gen()': *mut [U; _]
74 185..419 '{ ...rr); }': ()
75 195..198 'arr': &[u8; _]
76 211..215 '&[1]': &[u8; _]
77 212..215 '[1]': [u8; _]
78 213..214 '1': u8
79 226..227 'a': &[u8]
80 236..239 'arr': &[u8; _]
81 249..250 'b': u8
82 253..254 'f': fn f<u8>(&[u8]) -> u8
83 253..259 'f(arr)': u8
84 255..258 'arr': &[u8; _]
85 269..270 'c': &[u8]
86 279..286 '{ arr }': &[u8]
87 281..284 'arr': &[u8; _]
88 296..297 'd': u8
89 300..301 'g': fn g<u8>(S<&[u8]>) -> u8
90 300..315 'g(S { a: arr })': u8
91 302..314 'S { a: arr }': S<&[u8]>
92 309..312 'arr': &[u8; _]
93 325..326 'e': [&[u8]; _]
94 340..345 '[arr]': [&[u8]; _]
95 341..344 'arr': &[u8; _]
96 355..356 'f': [&[u8]; _]
97 370..378 '[arr; 2]': [&[u8]; _]
98 371..374 'arr': &[u8; _]
99 376..377 '2': usize
100 388..389 'g': (&[u8], &[u8])
101 406..416 '(arr, arr)': (&[u8], &[u8])
102 407..410 'arr': &[u8; _]
103 412..415 'arr': &[u8; _]
104 "]],
105 );
106}
107
108#[test]
109fn infer_let_stmt_coerce() {
110 check_infer(
111 r"
112 fn test() {
113 let x: &[isize] = &[1];
114 let x: *const [isize] = &[1];
115 }
116 ",
117 expect![[r"
118 10..75 '{ ...[1]; }': ()
119 20..21 'x': &[isize]
120 34..38 '&[1]': &[isize; _]
121 35..38 '[1]': [isize; _]
122 36..37 '1': isize
123 48..49 'x': *const [isize]
124 68..72 '&[1]': &[isize; _]
125 69..72 '[1]': [isize; _]
126 70..71 '1': isize
127 "]],
128 );
129}
130
131#[test]
132fn infer_custom_coerce_unsized() {
133 check_infer(
134 r#"
135 struct A<T: ?Sized>(*const T);
136 struct B<T: ?Sized>(*const T);
137 struct C<T: ?Sized> { inner: *const T }
138
139 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<B<U>> for B<T> {}
140 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<C<U>> for C<T> {}
141
142 fn foo1<T>(x: A<[T]>) -> A<[T]> { x }
143 fn foo2<T>(x: B<[T]>) -> B<[T]> { x }
144 fn foo3<T>(x: C<[T]>) -> C<[T]> { x }
145
146 fn test(a: A<[u8; 2]>, b: B<[u8; 2]>, c: C<[u8; 2]>) {
147 let d = foo1(a);
148 let e = foo2(b);
149 let f = foo3(c);
150 }
151
152
153 #[lang = "sized"]
154 pub trait Sized {}
155 #[lang = "unsize"]
156 pub trait Unsize<T: ?Sized> {}
157 #[lang = "coerce_unsized"]
158 pub trait CoerceUnsized<T> {}
159
160 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
161 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
162 "#,
163 expect![[r"
164 257..258 'x': A<[T]>
165 278..283 '{ x }': A<[T]>
166 280..281 'x': A<[T]>
167 295..296 'x': B<[T]>
168 316..321 '{ x }': B<[T]>
169 318..319 'x': B<[T]>
170 333..334 'x': C<[T]>
171 354..359 '{ x }': C<[T]>
172 356..357 'x': C<[T]>
173 369..370 'a': A<[u8; _]>
174 384..385 'b': B<[u8; _]>
175 399..400 'c': C<[u8; _]>
176 414..480 '{ ...(c); }': ()
177 424..425 'd': A<[{unknown}]>
178 428..432 'foo1': fn foo1<{unknown}>(A<[{unknown}]>) -> A<[{unknown}]>
179 428..435 'foo1(a)': A<[{unknown}]>
180 433..434 'a': A<[u8; _]>
181 445..446 'e': B<[u8]>
182 449..453 'foo2': fn foo2<u8>(B<[u8]>) -> B<[u8]>
183 449..456 'foo2(b)': B<[u8]>
184 454..455 'b': B<[u8; _]>
185 466..467 'f': C<[u8]>
186 470..474 'foo3': fn foo3<u8>(C<[u8]>) -> C<[u8]>
187 470..477 'foo3(c)': C<[u8]>
188 475..476 'c': C<[u8; _]>
189 "]],
190 );
191}
192
193#[test]
194fn infer_if_coerce() {
195 check_infer(
196 r#"
197 fn foo<T>(x: &[T]) -> &[T] { loop {} }
198 fn test() {
199 let x = if true {
200 foo(&[1])
201 } else {
202 &[1]
203 };
204 }
205
206
207 #[lang = "sized"]
208 pub trait Sized {}
209 #[lang = "unsize"]
210 pub trait Unsize<T: ?Sized> {}
211 "#,
212 expect![[r"
213 10..11 'x': &[T]
214 27..38 '{ loop {} }': &[T]
215 29..36 'loop {}': !
216 34..36 '{}': ()
217 49..125 '{ ... }; }': ()
218 59..60 'x': &[i32]
219 63..122 'if tru... }': &[i32]
220 66..70 'true': bool
221 71..96 '{ ... }': &[i32]
222 81..84 'foo': fn foo<i32>(&[i32]) -> &[i32]
223 81..90 'foo(&[1])': &[i32]
224 85..89 '&[1]': &[i32; _]
225 86..89 '[1]': [i32; _]
226 87..88 '1': i32
227 102..122 '{ ... }': &[i32; _]
228 112..116 '&[1]': &[i32; _]
229 113..116 '[1]': [i32; _]
230 114..115 '1': i32
231 "]],
232 );
233}
234
235#[test]
236fn infer_if_else_coerce() {
237 check_infer(
238 r#"
239 fn foo<T>(x: &[T]) -> &[T] { loop {} }
240 fn test() {
241 let x = if true {
242 &[1]
243 } else {
244 foo(&[1])
245 };
246 }
247
248 #[lang = "sized"]
249 pub trait Sized {}
250 #[lang = "unsize"]
251 pub trait Unsize<T: ?Sized> {}
252 #[lang = "coerce_unsized"]
253 pub trait CoerceUnsized<T> {}
254
255 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
256 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
257 "#,
258 expect![[r"
259 10..11 'x': &[T]
260 27..38 '{ loop {} }': &[T]
261 29..36 'loop {}': !
262 34..36 '{}': ()
263 49..125 '{ ... }; }': ()
264 59..60 'x': &[i32]
265 63..122 'if tru... }': &[i32]
266 66..70 'true': bool
267 71..91 '{ ... }': &[i32; _]
268 81..85 '&[1]': &[i32; _]
269 82..85 '[1]': [i32; _]
270 83..84 '1': i32
271 97..122 '{ ... }': &[i32]
272 107..110 'foo': fn foo<i32>(&[i32]) -> &[i32]
273 107..116 'foo(&[1])': &[i32]
274 111..115 '&[1]': &[i32; _]
275 112..115 '[1]': [i32; _]
276 113..114 '1': i32
277 "]],
278 )
279}
280
281#[test]
282fn infer_match_first_coerce() {
283 check_infer(
284 r#"
285 fn foo<T>(x: &[T]) -> &[T] { loop {} }
286 fn test(i: i32) {
287 let x = match i {
288 2 => foo(&[2]),
289 1 => &[1],
290 _ => &[3],
291 };
292 }
293
294 #[lang = "sized"]
295 pub trait Sized {}
296 #[lang = "unsize"]
297 pub trait Unsize<T: ?Sized> {}
298 "#,
299 expect![[r"
300 10..11 'x': &[T]
301 27..38 '{ loop {} }': &[T]
302 29..36 'loop {}': !
303 34..36 '{}': ()
304 47..48 'i': i32
305 55..149 '{ ... }; }': ()
306 65..66 'x': &[i32]
307 69..146 'match ... }': &[i32]
308 75..76 'i': i32
309 87..88 '2': i32
310 87..88 '2': i32
311 92..95 'foo': fn foo<i32>(&[i32]) -> &[i32]
312 92..101 'foo(&[2])': &[i32]
313 96..100 '&[2]': &[i32; _]
314 97..100 '[2]': [i32; _]
315 98..99 '2': i32
316 111..112 '1': i32
317 111..112 '1': i32
318 116..120 '&[1]': &[i32; _]
319 117..120 '[1]': [i32; _]
320 118..119 '1': i32
321 130..131 '_': i32
322 135..139 '&[3]': &[i32; _]
323 136..139 '[3]': [i32; _]
324 137..138 '3': i32
325 "]],
326 );
327}
328
329#[test]
330fn infer_match_second_coerce() {
331 check_infer(
332 r#"
333 fn foo<T>(x: &[T]) -> &[T] { loop {} }
334 fn test(i: i32) {
335 let x = match i {
336 1 => &[1],
337 2 => foo(&[2]),
338 _ => &[3],
339 };
340 }
341
342 #[lang = "sized"]
343 pub trait Sized {}
344 #[lang = "unsize"]
345 pub trait Unsize<T: ?Sized> {}
346 #[lang = "coerce_unsized"]
347 pub trait CoerceUnsized<T> {}
348
349 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
350 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
351 "#,
352 expect![[r"
353 10..11 'x': &[T]
354 27..38 '{ loop {} }': &[T]
355 29..36 'loop {}': !
356 34..36 '{}': ()
357 47..48 'i': i32
358 55..149 '{ ... }; }': ()
359 65..66 'x': &[i32]
360 69..146 'match ... }': &[i32]
361 75..76 'i': i32
362 87..88 '1': i32
363 87..88 '1': i32
364 92..96 '&[1]': &[i32; _]
365 93..96 '[1]': [i32; _]
366 94..95 '1': i32
367 106..107 '2': i32
368 106..107 '2': i32
369 111..114 'foo': fn foo<i32>(&[i32]) -> &[i32]
370 111..120 'foo(&[2])': &[i32]
371 115..119 '&[2]': &[i32; _]
372 116..119 '[2]': [i32; _]
373 117..118 '2': i32
374 130..131 '_': i32
375 135..139 '&[3]': &[i32; _]
376 136..139 '[3]': [i32; _]
377 137..138 '3': i32
378 "]],
379 );
380}
381
382#[test]
383fn coerce_merge_one_by_one1() {
384 mark::check!(coerce_merge_fail_fallback);
385
386 check_infer(
387 r"
388 fn test() {
389 let t = &mut 1;
390 let x = match 1 {
391 1 => t as *mut i32,
392 2 => t as &i32,
393 _ => t as *const i32,
394 };
395 }
396 ",
397 expect![[r"
398 10..144 '{ ... }; }': ()
399 20..21 't': &mut i32
400 24..30 '&mut 1': &mut i32
401 29..30 '1': i32
402 40..41 'x': *const i32
403 44..141 'match ... }': *const i32
404 50..51 '1': i32
405 62..63 '1': i32
406 62..63 '1': i32
407 67..68 't': &mut i32
408 67..80 't as *mut i32': *mut i32
409 90..91 '2': i32
410 90..91 '2': i32
411 95..96 't': &mut i32
412 95..104 't as &i32': &i32
413 114..115 '_': i32
414 119..120 't': &mut i32
415 119..134 't as *const i32': *const i32
416 "]],
417 );
418}
419
420#[test]
421fn return_coerce_unknown() {
422 check_infer_with_mismatches(
423 r"
424 fn foo() -> u32 {
425 return unknown;
426 }
427 ",
428 expect![[r"
429 16..39 '{ ...own; }': u32
430 22..36 'return unknown': !
431 29..36 'unknown': u32
432 "]],
433 );
434}
435
436#[test]
437fn coerce_autoderef() {
438 check_infer_with_mismatches(
439 r"
440 struct Foo;
441 fn takes_ref_foo(x: &Foo) {}
442 fn test() {
443 takes_ref_foo(&Foo);
444 takes_ref_foo(&&Foo);
445 takes_ref_foo(&&&Foo);
446 }
447 ",
448 expect![[r"
449 29..30 'x': &Foo
450 38..40 '{}': ()
451 51..132 '{ ...oo); }': ()
452 57..70 'takes_ref_foo': fn takes_ref_foo(&Foo)
453 57..76 'takes_...(&Foo)': ()
454 71..75 '&Foo': &Foo
455 72..75 'Foo': Foo
456 82..95 'takes_ref_foo': fn takes_ref_foo(&Foo)
457 82..102 'takes_...&&Foo)': ()
458 96..101 '&&Foo': &&Foo
459 97..101 '&Foo': &Foo
460 98..101 'Foo': Foo
461 108..121 'takes_ref_foo': fn takes_ref_foo(&Foo)
462 108..129 'takes_...&&Foo)': ()
463 122..128 '&&&Foo': &&&Foo
464 123..128 '&&Foo': &&Foo
465 124..128 '&Foo': &Foo
466 125..128 'Foo': Foo
467 "]],
468 );
469}
470
471#[test]
472fn coerce_autoderef_generic() {
473 check_infer_with_mismatches(
474 r"
475 struct Foo;
476 fn takes_ref<T>(x: &T) -> T { *x }
477 fn test() {
478 takes_ref(&Foo);
479 takes_ref(&&Foo);
480 takes_ref(&&&Foo);
481 }
482 ",
483 expect![[r"
484 28..29 'x': &T
485 40..46 '{ *x }': T
486 42..44 '*x': T
487 43..44 'x': &T
488 57..126 '{ ...oo); }': ()
489 63..72 'takes_ref': fn takes_ref<Foo>(&Foo) -> Foo
490 63..78 'takes_ref(&Foo)': Foo
491 73..77 '&Foo': &Foo
492 74..77 'Foo': Foo
493 84..93 'takes_ref': fn takes_ref<&Foo>(&&Foo) -> &Foo
494 84..100 'takes_...&&Foo)': &Foo
495 94..99 '&&Foo': &&Foo
496 95..99 '&Foo': &Foo
497 96..99 'Foo': Foo
498 106..115 'takes_ref': fn takes_ref<&&Foo>(&&&Foo) -> &&Foo
499 106..123 'takes_...&&Foo)': &&Foo
500 116..122 '&&&Foo': &&&Foo
501 117..122 '&&Foo': &&Foo
502 118..122 '&Foo': &Foo
503 119..122 'Foo': Foo
504 "]],
505 );
506}
507
508#[test]
509fn coerce_autoderef_block() {
510 check_infer_with_mismatches(
511 r#"
512 struct String {}
513 #[lang = "deref"]
514 trait Deref { type Target; }
515 impl Deref for String { type Target = str; }
516 fn takes_ref_str(x: &str) {}
517 fn returns_string() -> String { loop {} }
518 fn test() {
519 takes_ref_str(&{ returns_string() });
520 }
521 "#,
522 expect![[r"
523 126..127 'x': &str
524 135..137 '{}': ()
525 168..179 '{ loop {} }': String
526 170..177 'loop {}': !
527 175..177 '{}': ()
528 190..235 '{ ... }); }': ()
529 196..209 'takes_ref_str': fn takes_ref_str(&str)
530 196..232 'takes_...g() })': ()
531 210..231 '&{ ret...ng() }': &String
532 211..231 '{ retu...ng() }': String
533 213..227 'returns_string': fn returns_string() -> String
534 213..229 'return...ring()': String
535 "]],
536 );
537}
538
539#[test]
540fn closure_return_coerce() {
541 check_infer_with_mismatches(
542 r"
543 fn foo() {
544 let x = || {
545 if true {
546 return &1u32;
547 }
548 &&1u32
549 };
550 }
551 ",
552 expect![[r"
553 9..105 '{ ... }; }': ()
554 19..20 'x': || -> &u32
555 23..102 '|| { ... }': || -> &u32
556 26..102 '{ ... }': &u32
557 36..81 'if tru... }': ()
558 39..43 'true': bool
559 44..81 '{ ... }': ()
560 58..70 'return &1u32': !
561 65..70 '&1u32': &u32
562 66..70 '1u32': u32
563 90..96 '&&1u32': &&u32
564 91..96 '&1u32': &u32
565 92..96 '1u32': u32
566 "]],
567 );
568}
569
570#[test]
571fn coerce_fn_item_to_fn_ptr() {
572 check_infer_with_mismatches(
573 r"
574 fn foo(x: u32) -> isize { 1 }
575 fn test() {
576 let f: fn(u32) -> isize = foo;
577 }
578 ",
579 expect![[r"
580 7..8 'x': u32
581 24..29 '{ 1 }': isize
582 26..27 '1': isize
583 40..78 '{ ...foo; }': ()
584 50..51 'f': fn(u32) -> isize
585 72..75 'foo': fn foo(u32) -> isize
586 "]],
587 );
588}
589
590#[test]
591fn coerce_fn_items_in_match_arms() {
592 mark::check!(coerce_fn_reification);
593
594 check_infer_with_mismatches(
595 r"
596 fn foo1(x: u32) -> isize { 1 }
597 fn foo2(x: u32) -> isize { 2 }
598 fn foo3(x: u32) -> isize { 3 }
599 fn test() {
600 let x = match 1 {
601 1 => foo1,
602 2 => foo2,
603 _ => foo3,
604 };
605 }
606 ",
607 expect![[r"
608 8..9 'x': u32
609 25..30 '{ 1 }': isize
610 27..28 '1': isize
611 39..40 'x': u32
612 56..61 '{ 2 }': isize
613 58..59 '2': isize
614 70..71 'x': u32
615 87..92 '{ 3 }': isize
616 89..90 '3': isize
617 103..192 '{ ... }; }': ()
618 113..114 'x': fn(u32) -> isize
619 117..189 'match ... }': fn(u32) -> isize
620 123..124 '1': i32
621 135..136 '1': i32
622 135..136 '1': i32
623 140..144 'foo1': fn foo1(u32) -> isize
624 154..155 '2': i32
625 154..155 '2': i32
626 159..163 'foo2': fn foo2(u32) -> isize
627 173..174 '_': i32
628 178..182 'foo3': fn foo3(u32) -> isize
629 "]],
630 );
631}
632
633#[test]
634fn coerce_closure_to_fn_ptr() {
635 check_infer_with_mismatches(
636 r"
637 fn test() {
638 let f: fn(u32) -> isize = |x| { 1 };
639 }
640 ",
641 expect![[r"
642 10..54 '{ ...1 }; }': ()
643 20..21 'f': fn(u32) -> isize
644 42..51 '|x| { 1 }': |u32| -> isize
645 43..44 'x': u32
646 46..51 '{ 1 }': isize
647 48..49 '1': isize
648 "]],
649 );
650}
651
652#[test]
653fn coerce_placeholder_ref() {
654 // placeholders should unify, even behind references
655 check_infer_with_mismatches(
656 r"
657 struct S<T> { t: T }
658 impl<TT> S<TT> {
659 fn get(&self) -> &TT {
660 &self.t
661 }
662 }
663 ",
664 expect![[r"
665 50..54 'self': &S<TT>
666 63..86 '{ ... }': &TT
667 73..80 '&self.t': &TT
668 74..78 'self': &S<TT>
669 74..80 'self.t': TT
670 "]],
671 );
672}
673
674#[test]
675fn coerce_unsize_array() {
676 check_infer_with_mismatches(
677 r#"
678 #[lang = "unsize"]
679 pub trait Unsize<T> {}
680 #[lang = "coerce_unsized"]
681 pub trait CoerceUnsized<T> {}
682
683 impl<T: Unsize<U>, U> CoerceUnsized<&U> for &T {}
684
685 fn test() {
686 let f: &[usize] = &[1, 2, 3];
687 }
688 "#,
689 expect![[r"
690 161..198 '{ ... 3]; }': ()
691 171..172 'f': &[usize]
692 185..195 '&[1, 2, 3]': &[usize; _]
693 186..195 '[1, 2, 3]': [usize; _]
694 187..188 '1': usize
695 190..191 '2': usize
696 193..194 '3': usize
697 "]],
698 );
699}
700
701#[test]
702fn coerce_unsize_trait_object_simple() {
703 check_infer_with_mismatches(
704 r#"
705 #[lang = "sized"]
706 pub trait Sized {}
707 #[lang = "unsize"]
708 pub trait Unsize<T> {}
709 #[lang = "coerce_unsized"]
710 pub trait CoerceUnsized<T> {}
711
712 impl<T: Unsize<U>, U> CoerceUnsized<&U> for &T {}
713
714 trait Foo<T, U> {}
715 trait Bar<U, T, X>: Foo<T, U> {}
716 trait Baz<T, X>: Bar<usize, T, X> {}
717
718 struct S<T, X>;
719 impl<T, X> Foo<T, usize> for S<T, X> {}
720 impl<T, X> Bar<usize, T, X> for S<T, X> {}
721 impl<T, X> Baz<T, X> for S<T, X> {}
722
723 fn test() {
724 let obj: &dyn Baz<i8, i16> = &S;
725 let obj: &dyn Bar<_, i8, i16> = &S;
726 let obj: &dyn Foo<i8, _> = &S;
727 }
728 "#,
729 expect![[r"
730 424..539 '{ ... &S; }': ()
731 434..437 'obj': &dyn Baz<i8, i16>
732 459..461 '&S': &S<i8, i16>
733 460..461 'S': S<i8, i16>
734 471..474 'obj': &dyn Bar<usize, i8, i16>
735 499..501 '&S': &S<i8, i16>
736 500..501 'S': S<i8, i16>
737 511..514 'obj': &dyn Foo<i8, usize>
738 534..536 '&S': &S<i8, {unknown}>
739 535..536 'S': S<i8, {unknown}>
740 "]],
741 );
742}
743
744#[test]
745// The rust reference says this should be possible, but rustc doesn't implement
746// it. We used to support it, but Chalk doesn't.
747#[ignore]
748fn coerce_unsize_trait_object_to_trait_object() {
749 check_infer_with_mismatches(
750 r#"
751 #[lang = "sized"]
752 pub trait Sized {}
753 #[lang = "unsize"]
754 pub trait Unsize<T> {}
755 #[lang = "coerce_unsized"]
756 pub trait CoerceUnsized<T> {}
757
758 impl<T: Unsize<U>, U> CoerceUnsized<&U> for &T {}
759
760 trait Foo<T, U> {}
761 trait Bar<U, T, X>: Foo<T, U> {}
762 trait Baz<T, X>: Bar<usize, T, X> {}
763
764 struct S<T, X>;
765 impl<T, X> Foo<T, usize> for S<T, X> {}
766 impl<T, X> Bar<usize, T, X> for S<T, X> {}
767 impl<T, X> Baz<T, X> for S<T, X> {}
768
769 fn test() {
770 let obj: &dyn Baz<i8, i16> = &S;
771 let obj: &dyn Bar<_, _, _> = obj;
772 let obj: &dyn Foo<_, _> = obj;
773 let obj2: &dyn Baz<i8, i16> = &S;
774 let _: &dyn Foo<_, _> = obj2;
775 }
776 "#,
777 expect![[r"
778 424..609 '{ ...bj2; }': ()
779 434..437 'obj': &dyn Baz<i8, i16>
780 459..461 '&S': &S<i8, i16>
781 460..461 'S': S<i8, i16>
782 471..474 'obj': &dyn Bar<usize, i8, i16>
783 496..499 'obj': &dyn Baz<i8, i16>
784 509..512 'obj': &dyn Foo<i8, usize>
785 531..534 'obj': &dyn Bar<usize, i8, i16>
786 544..548 'obj2': &dyn Baz<i8, i16>
787 570..572 '&S': &S<i8, i16>
788 571..572 'S': S<i8, i16>
789 582..583 '_': &dyn Foo<i8, usize>
790 602..606 'obj2': &dyn Baz<i8, i16>
791 "]],
792 );
793}
794
795#[test]
796fn coerce_unsize_super_trait_cycle() {
797 check_infer_with_mismatches(
798 r#"
799 #[lang = "sized"]
800 pub trait Sized {}
801 #[lang = "unsize"]
802 pub trait Unsize<T> {}
803 #[lang = "coerce_unsized"]
804 pub trait CoerceUnsized<T> {}
805
806 impl<T: Unsize<U>, U> CoerceUnsized<&U> for &T {}
807
808 trait A {}
809 trait B: C + A {}
810 trait C: B {}
811 trait D: C
812
813 struct S;
814 impl A for S {}
815 impl B for S {}
816 impl C for S {}
817 impl D for S {}
818
819 fn test() {
820 let obj: &dyn D = &S;
821 let obj: &dyn A = &S;
822 }
823 "#,
824 expect![[r"
825 328..383 '{ ... &S; }': ()
826 338..341 'obj': &dyn D
827 352..354 '&S': &S
828 353..354 'S': S
829 364..367 'obj': &dyn A
830 378..380 '&S': &S
831 379..380 'S': S
832 "]],
833 );
834}
835
836#[ignore]
837#[test]
838fn coerce_unsize_generic() {
839 // FIXME: Implement this
840 // https://doc.rust-lang.org/reference/type-coercions.html#unsized-coercions
841 check_infer_with_mismatches(
842 r#"
843 #[lang = "unsize"]
844 pub trait Unsize<T> {}
845 #[lang = "coerce_unsized"]
846 pub trait CoerceUnsized<T> {}
847
848 impl<T: Unsize<U>, U> CoerceUnsized<&U> for &T {}
849
850 struct Foo<T> { t: T };
851 struct Bar<T>(Foo<T>);
852
853 fn test() {
854 let _: &Foo<[usize]> = &Foo { t: [1, 2, 3] };
855 let _: &Bar<[usize]> = &Bar(Foo { t: [1, 2, 3] });
856 }
857 "#,
858 expect![[r"
859 "]],
860 );
861}
diff --git a/crates/hir_ty/src/tests/display_source_code.rs b/crates/hir_ty/src/tests/display_source_code.rs
new file mode 100644
index 000000000..b502135d8
--- /dev/null
+++ b/crates/hir_ty/src/tests/display_source_code.rs
@@ -0,0 +1,41 @@
1use super::check_types_source_code;
2
3#[test]
4fn qualify_path_to_submodule() {
5 check_types_source_code(
6 r#"
7mod foo {
8 pub struct Foo;
9}
10
11fn bar() {
12 let foo: foo::Foo = foo::Foo;
13 foo
14} //^ foo::Foo
15
16"#,
17 );
18}
19
20#[test]
21fn omit_default_type_parameters() {
22 check_types_source_code(
23 r#"
24struct Foo<T = u8> { t: T }
25fn main() {
26 let foo = Foo { t: 5u8 };
27 foo;
28} //^ Foo
29"#,
30 );
31
32 check_types_source_code(
33 r#"
34struct Foo<K, T = u8> { k: K, t: T }
35fn main() {
36 let foo = Foo { k: 400, t: 5u8 };
37 foo;
38} //^ Foo<i32>
39"#,
40 );
41}
diff --git a/crates/hir_ty/src/tests/macros.rs b/crates/hir_ty/src/tests/macros.rs
new file mode 100644
index 000000000..597a195d0
--- /dev/null
+++ b/crates/hir_ty/src/tests/macros.rs
@@ -0,0 +1,787 @@
1use std::fs;
2
3use expect_test::expect;
4use test_utils::project_dir;
5
6use super::{check_infer, check_types};
7
8#[test]
9fn cfg_impl_def() {
10 check_types(
11 r#"
12//- /main.rs crate:main deps:foo cfg:test
13use foo::S as T;
14struct S;
15
16#[cfg(test)]
17impl S {
18 fn foo1(&self) -> i32 { 0 }
19}
20
21#[cfg(not(test))]
22impl S {
23 fn foo2(&self) -> i32 { 0 }
24}
25
26fn test() {
27 let t = (S.foo1(), S.foo2(), T.foo3(), T.foo4());
28 t;
29} //^ (i32, {unknown}, i32, {unknown})
30
31//- /foo.rs crate:foo
32struct S;
33
34#[cfg(not(test))]
35impl S {
36 fn foo3(&self) -> i32 { 0 }
37}
38
39#[cfg(test)]
40impl S {
41 fn foo4(&self) -> i32 { 0 }
42}
43"#,
44 );
45}
46
47#[test]
48fn infer_macros_expanded() {
49 check_infer(
50 r#"
51 struct Foo(Vec<i32>);
52
53 macro_rules! foo {
54 ($($item:expr),*) => {
55 {
56 Foo(vec![$($item,)*])
57 }
58 };
59 }
60
61 fn main() {
62 let x = foo!(1,2);
63 }
64 "#,
65 expect![[r#"
66 !0..17 '{Foo(v...,2,])}': Foo
67 !1..4 'Foo': Foo({unknown}) -> Foo
68 !1..16 'Foo(vec![1,2,])': Foo
69 !5..15 'vec![1,2,]': {unknown}
70 155..181 '{ ...,2); }': ()
71 165..166 'x': Foo
72 "#]],
73 );
74}
75
76#[test]
77fn infer_legacy_textual_scoped_macros_expanded() {
78 check_infer(
79 r#"
80 struct Foo(Vec<i32>);
81
82 #[macro_use]
83 mod m {
84 macro_rules! foo {
85 ($($item:expr),*) => {
86 {
87 Foo(vec![$($item,)*])
88 }
89 };
90 }
91 }
92
93 fn main() {
94 let x = foo!(1,2);
95 let y = crate::foo!(1,2);
96 }
97 "#,
98 expect![[r#"
99 !0..17 '{Foo(v...,2,])}': Foo
100 !1..4 'Foo': Foo({unknown}) -> Foo
101 !1..16 'Foo(vec![1,2,])': Foo
102 !5..15 'vec![1,2,]': {unknown}
103 194..250 '{ ...,2); }': ()
104 204..205 'x': Foo
105 227..228 'y': {unknown}
106 231..247 'crate:...!(1,2)': {unknown}
107 "#]],
108 );
109}
110
111#[test]
112fn infer_path_qualified_macros_expanded() {
113 check_infer(
114 r#"
115 #[macro_export]
116 macro_rules! foo {
117 () => { 42i32 }
118 }
119
120 mod m {
121 pub use super::foo as bar;
122 }
123
124 fn main() {
125 let x = crate::foo!();
126 let y = m::bar!();
127 }
128 "#,
129 expect![[r#"
130 !0..5 '42i32': i32
131 !0..5 '42i32': i32
132 110..163 '{ ...!(); }': ()
133 120..121 'x': i32
134 147..148 'y': i32
135 "#]],
136 );
137}
138
139#[test]
140fn expr_macro_expanded_in_various_places() {
141 check_infer(
142 r#"
143 macro_rules! spam {
144 () => (1isize);
145 }
146
147 fn spam() {
148 spam!();
149 (spam!());
150 spam!().spam(spam!());
151 for _ in spam!() {}
152 || spam!();
153 while spam!() {}
154 break spam!();
155 return spam!();
156 match spam!() {
157 _ if spam!() => spam!(),
158 }
159 spam!()(spam!());
160 Spam { spam: spam!() };
161 spam!()[spam!()];
162 await spam!();
163 spam!() as usize;
164 &spam!();
165 -spam!();
166 spam!()..spam!();
167 spam!() + spam!();
168 }
169 "#,
170 expect![[r#"
171 !0..6 '1isize': isize
172 !0..6 '1isize': isize
173 !0..6 '1isize': isize
174 !0..6 '1isize': isize
175 !0..6 '1isize': isize
176 !0..6 '1isize': isize
177 !0..6 '1isize': isize
178 !0..6 '1isize': isize
179 !0..6 '1isize': isize
180 !0..6 '1isize': isize
181 !0..6 '1isize': isize
182 !0..6 '1isize': isize
183 !0..6 '1isize': isize
184 !0..6 '1isize': isize
185 !0..6 '1isize': isize
186 !0..6 '1isize': isize
187 !0..6 '1isize': isize
188 !0..6 '1isize': isize
189 !0..6 '1isize': isize
190 !0..6 '1isize': isize
191 !0..6 '1isize': isize
192 !0..6 '1isize': isize
193 !0..6 '1isize': isize
194 !0..6 '1isize': isize
195 !0..6 '1isize': isize
196 53..456 '{ ...!(); }': ()
197 87..108 'spam!(...am!())': {unknown}
198 114..133 'for _ ...!() {}': ()
199 118..119 '_': {unknown}
200 131..133 '{}': ()
201 138..148 '|| spam!()': || -> isize
202 154..170 'while ...!() {}': ()
203 168..170 '{}': ()
204 175..188 'break spam!()': !
205 194..208 'return spam!()': !
206 214..268 'match ... }': isize
207 238..239 '_': isize
208 273..289 'spam!(...am!())': {unknown}
209 295..317 'Spam {...m!() }': {unknown}
210 323..339 'spam!(...am!()]': {unknown}
211 364..380 'spam!(... usize': usize
212 386..394 '&spam!()': &isize
213 400..408 '-spam!()': isize
214 414..430 'spam!(...pam!()': {unknown}
215 436..453 'spam!(...pam!()': isize
216 "#]],
217 );
218}
219
220#[test]
221fn infer_type_value_macro_having_same_name() {
222 check_infer(
223 r#"
224 #[macro_export]
225 macro_rules! foo {
226 () => {
227 mod foo {
228 pub use super::foo;
229 }
230 };
231 ($x:tt) => {
232 $x
233 };
234 }
235
236 foo!();
237
238 fn foo() {
239 let foo = foo::foo!(42i32);
240 }
241 "#,
242 expect![[r#"
243 !0..5 '42i32': i32
244 170..205 '{ ...32); }': ()
245 180..183 'foo': i32
246 "#]],
247 );
248}
249
250#[test]
251fn processes_impls_generated_by_macros() {
252 check_types(
253 r#"
254macro_rules! m {
255 ($ident:ident) => (impl Trait for $ident {})
256}
257trait Trait { fn foo(self) -> u128 {} }
258struct S;
259m!(S);
260fn test() { S.foo(); }
261 //^ u128
262"#,
263 );
264}
265
266#[test]
267fn infer_assoc_items_generated_by_macros() {
268 check_types(
269 r#"
270macro_rules! m {
271 () => (fn foo(&self) -> u128 {0})
272}
273struct S;
274impl S {
275 m!();
276}
277
278fn test() { S.foo(); }
279 //^ u128
280"#,
281 );
282}
283
284#[test]
285fn infer_assoc_items_generated_by_macros_chain() {
286 check_types(
287 r#"
288macro_rules! m_inner {
289 () => {fn foo(&self) -> u128 {0}}
290}
291macro_rules! m {
292 () => {m_inner!();}
293}
294
295struct S;
296impl S {
297 m!();
298}
299
300fn test() { S.foo(); }
301 //^ u128
302"#,
303 );
304}
305
306#[test]
307fn infer_macro_with_dollar_crate_is_correct_in_expr() {
308 check_types(
309 r#"
310//- /main.rs crate:main deps:foo
311fn test() {
312 let x = (foo::foo!(1), foo::foo!(2));
313 x;
314} //^ (i32, usize)
315
316//- /lib.rs crate:foo
317#[macro_export]
318macro_rules! foo {
319 (1) => { $crate::bar!() };
320 (2) => { 1 + $crate::baz() };
321}
322
323#[macro_export]
324macro_rules! bar {
325 () => { 42 }
326}
327
328pub fn baz() -> usize { 31usize }
329"#,
330 );
331}
332
333#[test]
334fn infer_macro_with_dollar_crate_is_correct_in_trait_associate_type() {
335 check_types(
336 r#"
337//- /main.rs crate:main deps:foo
338use foo::Trait;
339
340fn test() {
341 let msg = foo::Message(foo::MessageRef);
342 let r = msg.deref();
343 r;
344 //^ &MessageRef
345}
346
347//- /lib.rs crate:foo
348pub struct MessageRef;
349pub struct Message(MessageRef);
350
351pub trait Trait {
352 type Target;
353 fn deref(&self) -> &Self::Target;
354}
355
356#[macro_export]
357macro_rules! expand {
358 () => {
359 impl Trait for Message {
360 type Target = $crate::MessageRef;
361 fn deref(&self) -> &Self::Target {
362 &self.0
363 }
364 }
365 }
366}
367
368expand!();
369"#,
370 );
371}
372
373#[test]
374fn infer_type_value_non_legacy_macro_use_as() {
375 check_infer(
376 r#"
377 mod m {
378 macro_rules! _foo {
379 ($x:ident) => { type $x = u64; }
380 }
381 pub(crate) use _foo as foo;
382 }
383
384 m::foo!(foo);
385 use foo as bar;
386 fn f() -> bar { 0 }
387 fn main() {
388 let _a = f();
389 }
390 "#,
391 expect![[r#"
392 158..163 '{ 0 }': u64
393 160..161 '0': u64
394 174..196 '{ ...f(); }': ()
395 184..186 '_a': u64
396 190..191 'f': fn f() -> u64
397 190..193 'f()': u64
398 "#]],
399 );
400}
401
402#[test]
403fn infer_local_macro() {
404 check_infer(
405 r#"
406 fn main() {
407 macro_rules! foo {
408 () => { 1usize }
409 }
410 let _a = foo!();
411 }
412 "#,
413 expect![[r#"
414 !0..6 '1usize': usize
415 10..89 '{ ...!(); }': ()
416 16..65 'macro_... }': {unknown}
417 74..76 '_a': usize
418 "#]],
419 );
420}
421
422#[test]
423fn infer_local_inner_macros() {
424 check_types(
425 r#"
426//- /main.rs crate:main deps:foo
427fn test() {
428 let x = foo::foo!(1);
429 x;
430} //^ i32
431
432//- /lib.rs crate:foo
433#[macro_export(local_inner_macros)]
434macro_rules! foo {
435 (1) => { bar!() };
436}
437
438#[macro_export]
439macro_rules! bar {
440 () => { 42 }
441}
442
443"#,
444 );
445}
446
447#[test]
448fn infer_builtin_macros_line() {
449 check_infer(
450 r#"
451 #[rustc_builtin_macro]
452 macro_rules! line {() => {}}
453
454 fn main() {
455 let x = line!();
456 }
457 "#,
458 expect![[r#"
459 !0..1 '0': i32
460 63..87 '{ ...!(); }': ()
461 73..74 'x': i32
462 "#]],
463 );
464}
465
466#[test]
467fn infer_builtin_macros_file() {
468 check_infer(
469 r#"
470 #[rustc_builtin_macro]
471 macro_rules! file {() => {}}
472
473 fn main() {
474 let x = file!();
475 }
476 "#,
477 expect![[r#"
478 !0..2 '""': &str
479 63..87 '{ ...!(); }': ()
480 73..74 'x': &str
481 "#]],
482 );
483}
484
485#[test]
486fn infer_builtin_macros_column() {
487 check_infer(
488 r#"
489 #[rustc_builtin_macro]
490 macro_rules! column {() => {}}
491
492 fn main() {
493 let x = column!();
494 }
495 "#,
496 expect![[r#"
497 !0..1 '0': i32
498 65..91 '{ ...!(); }': ()
499 75..76 'x': i32
500 "#]],
501 );
502}
503
504#[test]
505fn infer_builtin_macros_concat() {
506 check_infer(
507 r#"
508 #[rustc_builtin_macro]
509 macro_rules! concat {() => {}}
510
511 fn main() {
512 let x = concat!("hello", concat!("world", "!"));
513 }
514 "#,
515 expect![[r#"
516 !0..13 '"helloworld!"': &str
517 65..121 '{ ...")); }': ()
518 75..76 'x': &str
519 "#]],
520 );
521}
522
523#[test]
524fn infer_builtin_macros_include() {
525 check_types(
526 r#"
527//- /main.rs
528#[rustc_builtin_macro]
529macro_rules! include {() => {}}
530
531include!("foo.rs");
532
533fn main() {
534 bar();
535} //^ u32
536
537//- /foo.rs
538fn bar() -> u32 {0}
539"#,
540 );
541}
542
543#[test]
544#[ignore]
545fn include_accidentally_quadratic() {
546 let file = project_dir().join("crates/syntax/test_data/accidentally_quadratic");
547 let big_file = fs::read_to_string(file).unwrap();
548 let big_file = vec![big_file; 10].join("\n");
549
550 let fixture = r#"
551//- /main.rs
552#[rustc_builtin_macro]
553macro_rules! include {() => {}}
554
555include!("foo.rs");
556
557fn main() {
558 RegisterBlock { };
559 //^ RegisterBlock
560}
561 "#;
562 let fixture = format!("{}\n//- /foo.rs\n{}", fixture, big_file);
563 check_types(&fixture);
564}
565
566#[test]
567fn infer_builtin_macros_include_concat() {
568 check_types(
569 r#"
570//- /main.rs
571#[rustc_builtin_macro]
572macro_rules! include {() => {}}
573
574#[rustc_builtin_macro]
575macro_rules! concat {() => {}}
576
577include!(concat!("f", "oo.rs"));
578
579fn main() {
580 bar();
581} //^ u32
582
583//- /foo.rs
584fn bar() -> u32 {0}
585"#,
586 );
587}
588
589#[test]
590fn infer_builtin_macros_include_concat_with_bad_env_should_failed() {
591 check_types(
592 r#"
593//- /main.rs
594#[rustc_builtin_macro]
595macro_rules! include {() => {}}
596
597#[rustc_builtin_macro]
598macro_rules! concat {() => {}}
599
600#[rustc_builtin_macro]
601macro_rules! env {() => {}}
602
603include!(concat!(env!("OUT_DIR"), "/foo.rs"));
604
605fn main() {
606 bar();
607} //^ {unknown}
608
609//- /foo.rs
610fn bar() -> u32 {0}
611"#,
612 );
613}
614
615#[test]
616fn infer_builtin_macros_include_itself_should_failed() {
617 check_types(
618 r#"
619#[rustc_builtin_macro]
620macro_rules! include {() => {}}
621
622include!("main.rs");
623
624fn main() {
625 0
626} //^ i32
627"#,
628 );
629}
630
631#[test]
632fn infer_builtin_macros_concat_with_lazy() {
633 check_infer(
634 r#"
635 macro_rules! hello {() => {"hello"}}
636
637 #[rustc_builtin_macro]
638 macro_rules! concat {() => {}}
639
640 fn main() {
641 let x = concat!(hello!(), concat!("world", "!"));
642 }
643 "#,
644 expect![[r#"
645 !0..13 '"helloworld!"': &str
646 103..160 '{ ...")); }': ()
647 113..114 'x': &str
648 "#]],
649 );
650}
651
652#[test]
653fn infer_builtin_macros_env() {
654 check_infer(
655 r#"
656 //- /main.rs env:foo=bar
657 #[rustc_builtin_macro]
658 macro_rules! env {() => {}}
659
660 fn main() {
661 let x = env!("foo");
662 }
663 "#,
664 expect![[r#"
665 !0..22 '"__RA_...TED__"': &str
666 62..90 '{ ...o"); }': ()
667 72..73 'x': &str
668 "#]],
669 );
670}
671
672#[test]
673fn infer_derive_clone_simple() {
674 check_types(
675 r#"
676//- /main.rs crate:main deps:core
677#[derive(Clone)]
678struct S;
679fn test() {
680 S.clone();
681} //^ S
682
683//- /lib.rs crate:core
684#[prelude_import]
685use clone::*;
686mod clone {
687 trait Clone {
688 fn clone(&self) -> Self;
689 }
690}
691"#,
692 );
693}
694
695#[test]
696fn infer_derive_clone_in_core() {
697 check_types(
698 r#"
699//- /lib.rs crate:core
700#[prelude_import]
701use clone::*;
702mod clone {
703 trait Clone {
704 fn clone(&self) -> Self;
705 }
706}
707#[derive(Clone)]
708pub struct S;
709
710//- /main.rs crate:main deps:core
711use core::S;
712fn test() {
713 S.clone();
714} //^ S
715"#,
716 );
717}
718
719#[test]
720fn infer_derive_clone_with_params() {
721 check_types(
722 r#"
723//- /main.rs crate:main deps:core
724#[derive(Clone)]
725struct S;
726#[derive(Clone)]
727struct Wrapper<T>(T);
728struct NonClone;
729fn test() {
730 (Wrapper(S).clone(), Wrapper(NonClone).clone());
731 //^ (Wrapper<S>, {unknown})
732}
733
734//- /lib.rs crate:core
735#[prelude_import]
736use clone::*;
737mod clone {
738 trait Clone {
739 fn clone(&self) -> Self;
740 }
741}
742"#,
743 );
744}
745
746#[test]
747fn infer_custom_derive_simple() {
748 // FIXME: this test current now do nothing
749 check_types(
750 r#"
751//- /main.rs crate:main
752use foo::Foo;
753
754#[derive(Foo)]
755struct S{}
756
757fn test() {
758 S{};
759} //^ S
760"#,
761 );
762}
763
764#[test]
765fn macro_in_arm() {
766 check_infer(
767 r#"
768 macro_rules! unit {
769 () => { () };
770 }
771
772 fn main() {
773 let x = match () {
774 unit!() => 92u32,
775 };
776 }
777 "#,
778 expect![[r#"
779 51..110 '{ ... }; }': ()
780 61..62 'x': u32
781 65..107 'match ... }': u32
782 71..73 '()': ()
783 84..91 'unit!()': ()
784 95..100 '92u32': u32
785 "#]],
786 );
787}
diff --git a/crates/hir_ty/src/tests/method_resolution.rs b/crates/hir_ty/src/tests/method_resolution.rs
new file mode 100644
index 000000000..23b2601e6
--- /dev/null
+++ b/crates/hir_ty/src/tests/method_resolution.rs
@@ -0,0 +1,1053 @@
1use expect_test::expect;
2
3use super::{check_infer, check_types};
4
5#[test]
6fn infer_slice_method() {
7 check_infer(
8 r#"
9 #[lang = "slice"]
10 impl<T> [T] {
11 fn foo(&self) -> T {
12 loop {}
13 }
14 }
15
16 #[lang = "slice_alloc"]
17 impl<T> [T] {}
18
19 fn test(x: &[u8]) {
20 <[_]>::foo(x);
21 }
22 "#,
23 expect![[r#"
24 44..48 'self': &[T]
25 55..78 '{ ... }': T
26 65..72 'loop {}': !
27 70..72 '{}': ()
28 130..131 'x': &[u8]
29 140..162 '{ ...(x); }': ()
30 146..156 '<[_]>::foo': fn foo<u8>(&[u8]) -> u8
31 146..159 '<[_]>::foo(x)': u8
32 157..158 'x': &[u8]
33 "#]],
34 );
35}
36
37#[test]
38fn infer_associated_method_struct() {
39 check_infer(
40 r#"
41 struct A { x: u32 }
42
43 impl A {
44 fn new() -> A {
45 A { x: 0 }
46 }
47 }
48 fn test() {
49 let a = A::new();
50 a.x;
51 }
52 "#,
53 expect![[r#"
54 48..74 '{ ... }': A
55 58..68 'A { x: 0 }': A
56 65..66 '0': u32
57 87..121 '{ ...a.x; }': ()
58 97..98 'a': A
59 101..107 'A::new': fn new() -> A
60 101..109 'A::new()': A
61 115..116 'a': A
62 115..118 'a.x': u32
63 "#]],
64 );
65}
66
67#[test]
68fn infer_associated_method_enum() {
69 check_infer(
70 r#"
71 enum A { B, C }
72
73 impl A {
74 pub fn b() -> A {
75 A::B
76 }
77 pub fn c() -> A {
78 A::C
79 }
80 }
81 fn test() {
82 let a = A::b();
83 a;
84 let c = A::c();
85 c;
86 }
87 "#,
88 expect![[r#"
89 46..66 '{ ... }': A
90 56..60 'A::B': A
91 87..107 '{ ... }': A
92 97..101 'A::C': A
93 120..177 '{ ... c; }': ()
94 130..131 'a': A
95 134..138 'A::b': fn b() -> A
96 134..140 'A::b()': A
97 146..147 'a': A
98 157..158 'c': A
99 161..165 'A::c': fn c() -> A
100 161..167 'A::c()': A
101 173..174 'c': A
102 "#]],
103 );
104}
105
106#[test]
107fn infer_associated_method_with_modules() {
108 check_infer(
109 r#"
110 mod a {
111 struct A;
112 impl A { pub fn thing() -> A { A {} }}
113 }
114
115 mod b {
116 struct B;
117 impl B { pub fn thing() -> u32 { 99 }}
118
119 mod c {
120 struct C;
121 impl C { pub fn thing() -> C { C {} }}
122 }
123 }
124 use b::c;
125
126 fn test() {
127 let x = a::A::thing();
128 let y = b::B::thing();
129 let z = c::C::thing();
130 }
131 "#,
132 expect![[r#"
133 55..63 '{ A {} }': A
134 57..61 'A {}': A
135 125..131 '{ 99 }': u32
136 127..129 '99': u32
137 201..209 '{ C {} }': C
138 203..207 'C {}': C
139 240..324 '{ ...g(); }': ()
140 250..251 'x': A
141 254..265 'a::A::thing': fn thing() -> A
142 254..267 'a::A::thing()': A
143 277..278 'y': u32
144 281..292 'b::B::thing': fn thing() -> u32
145 281..294 'b::B::thing()': u32
146 304..305 'z': C
147 308..319 'c::C::thing': fn thing() -> C
148 308..321 'c::C::thing()': C
149 "#]],
150 );
151}
152
153#[test]
154fn infer_associated_method_generics() {
155 check_infer(
156 r#"
157 struct Gen<T> {
158 val: T
159 }
160
161 impl<T> Gen<T> {
162 pub fn make(val: T) -> Gen<T> {
163 Gen { val }
164 }
165 }
166
167 fn test() {
168 let a = Gen::make(0u32);
169 }
170 "#,
171 expect![[r#"
172 63..66 'val': T
173 81..108 '{ ... }': Gen<T>
174 91..102 'Gen { val }': Gen<T>
175 97..100 'val': T
176 122..154 '{ ...32); }': ()
177 132..133 'a': Gen<u32>
178 136..145 'Gen::make': fn make<u32>(u32) -> Gen<u32>
179 136..151 'Gen::make(0u32)': Gen<u32>
180 146..150 '0u32': u32
181 "#]],
182 );
183}
184
185#[test]
186fn infer_associated_method_generics_without_args() {
187 check_infer(
188 r#"
189 struct Gen<T> {
190 val: T
191 }
192
193 impl<T> Gen<T> {
194 pub fn make() -> Gen<T> {
195 loop { }
196 }
197 }
198
199 fn test() {
200 let a = Gen::<u32>::make();
201 }
202 "#,
203 expect![[r#"
204 75..99 '{ ... }': Gen<T>
205 85..93 'loop { }': !
206 90..93 '{ }': ()
207 113..148 '{ ...e(); }': ()
208 123..124 'a': Gen<u32>
209 127..143 'Gen::<...::make': fn make<u32>() -> Gen<u32>
210 127..145 'Gen::<...make()': Gen<u32>
211 "#]],
212 );
213}
214
215#[test]
216fn infer_associated_method_generics_2_type_params_without_args() {
217 check_infer(
218 r#"
219 struct Gen<T, U> {
220 val: T,
221 val2: U,
222 }
223
224 impl<T> Gen<u32, T> {
225 pub fn make() -> Gen<u32,T> {
226 loop { }
227 }
228 }
229
230 fn test() {
231 let a = Gen::<u32, u64>::make();
232 }
233 "#,
234 expect![[r#"
235 101..125 '{ ... }': Gen<u32, T>
236 111..119 'loop { }': !
237 116..119 '{ }': ()
238 139..179 '{ ...e(); }': ()
239 149..150 'a': Gen<u32, u64>
240 153..174 'Gen::<...::make': fn make<u64>() -> Gen<u32, u64>
241 153..176 'Gen::<...make()': Gen<u32, u64>
242 "#]],
243 );
244}
245
246#[test]
247fn cross_crate_associated_method_call() {
248 check_types(
249 r#"
250//- /main.rs crate:main deps:other_crate
251fn test() {
252 let x = other_crate::foo::S::thing();
253 x;
254} //^ i128
255
256//- /lib.rs crate:other_crate
257mod foo {
258 struct S;
259 impl S {
260 fn thing() -> i128 {}
261 }
262}
263"#,
264 );
265}
266
267#[test]
268fn infer_trait_method_simple() {
269 // the trait implementation is intentionally incomplete -- it shouldn't matter
270 check_infer(
271 r#"
272 trait Trait1 {
273 fn method(&self) -> u32;
274 }
275 struct S1;
276 impl Trait1 for S1 {}
277 trait Trait2 {
278 fn method(&self) -> i128;
279 }
280 struct S2;
281 impl Trait2 for S2 {}
282 fn test() {
283 S1.method(); // -> u32
284 S2.method(); // -> i128
285 }
286 "#,
287 expect![[r#"
288 30..34 'self': &Self
289 109..113 'self': &Self
290 169..227 '{ ...i128 }': ()
291 175..177 'S1': S1
292 175..186 'S1.method()': u32
293 202..204 'S2': S2
294 202..213 'S2.method()': i128
295 "#]],
296 );
297}
298
299#[test]
300fn infer_trait_method_scoped() {
301 // the trait implementation is intentionally incomplete -- it shouldn't matter
302 check_infer(
303 r#"
304 struct S;
305 mod foo {
306 pub trait Trait1 {
307 fn method(&self) -> u32;
308 }
309 impl Trait1 for super::S {}
310 }
311 mod bar {
312 pub trait Trait2 {
313 fn method(&self) -> i128;
314 }
315 impl Trait2 for super::S {}
316 }
317
318 mod foo_test {
319 use super::S;
320 use super::foo::Trait1;
321 fn test() {
322 S.method(); // -> u32
323 }
324 }
325
326 mod bar_test {
327 use super::S;
328 use super::bar::Trait2;
329 fn test() {
330 S.method(); // -> i128
331 }
332 }
333 "#,
334 expect![[r#"
335 62..66 'self': &Self
336 168..172 'self': &Self
337 299..336 '{ ... }': ()
338 309..310 'S': S
339 309..319 'S.method()': u32
340 415..453 '{ ... }': ()
341 425..426 'S': S
342 425..435 'S.method()': i128
343 "#]],
344 );
345}
346
347#[test]
348fn infer_trait_method_generic_1() {
349 // the trait implementation is intentionally incomplete -- it shouldn't matter
350 check_infer(
351 r#"
352 trait Trait<T> {
353 fn method(&self) -> T;
354 }
355 struct S;
356 impl Trait<u32> for S {}
357 fn test() {
358 S.method();
359 }
360 "#,
361 expect![[r#"
362 32..36 'self': &Self
363 91..110 '{ ...d(); }': ()
364 97..98 'S': S
365 97..107 'S.method()': u32
366 "#]],
367 );
368}
369
370#[test]
371fn infer_trait_method_generic_more_params() {
372 // the trait implementation is intentionally incomplete -- it shouldn't matter
373 check_infer(
374 r#"
375 trait Trait<T1, T2, T3> {
376 fn method1(&self) -> (T1, T2, T3);
377 fn method2(&self) -> (T3, T2, T1);
378 }
379 struct S1;
380 impl Trait<u8, u16, u32> for S1 {}
381 struct S2;
382 impl<T> Trait<i8, i16, T> for S2 {}
383 fn test() {
384 S1.method1(); // u8, u16, u32
385 S1.method2(); // u32, u16, u8
386 S2.method1(); // i8, i16, {unknown}
387 S2.method2(); // {unknown}, i16, i8
388 }
389 "#,
390 expect![[r#"
391 42..46 'self': &Self
392 81..85 'self': &Self
393 209..360 '{ ..., i8 }': ()
394 215..217 'S1': S1
395 215..227 'S1.method1()': (u8, u16, u32)
396 249..251 'S1': S1
397 249..261 'S1.method2()': (u32, u16, u8)
398 283..285 'S2': S2
399 283..295 'S2.method1()': (i8, i16, {unknown})
400 323..325 'S2': S2
401 323..335 'S2.method2()': ({unknown}, i16, i8)
402 "#]],
403 );
404}
405
406#[test]
407fn infer_trait_method_generic_2() {
408 // the trait implementation is intentionally incomplete -- it shouldn't matter
409 check_infer(
410 r#"
411 trait Trait<T> {
412 fn method(&self) -> T;
413 }
414 struct S<T>(T);
415 impl<U> Trait<U> for S<U> {}
416 fn test() {
417 S(1u32).method();
418 }
419 "#,
420 expect![[r#"
421 32..36 'self': &Self
422 101..126 '{ ...d(); }': ()
423 107..108 'S': S<u32>(u32) -> S<u32>
424 107..114 'S(1u32)': S<u32>
425 107..123 'S(1u32...thod()': u32
426 109..113 '1u32': u32
427 "#]],
428 );
429}
430
431#[test]
432fn infer_trait_assoc_method() {
433 check_infer(
434 r#"
435 trait Default {
436 fn default() -> Self;
437 }
438 struct S;
439 impl Default for S {}
440 fn test() {
441 let s1: S = Default::default();
442 let s2 = S::default();
443 let s3 = <S as Default>::default();
444 }
445 "#,
446 expect![[r#"
447 86..192 '{ ...t(); }': ()
448 96..98 's1': S
449 104..120 'Defaul...efault': fn default<S>() -> S
450 104..122 'Defaul...ault()': S
451 132..134 's2': S
452 137..147 'S::default': fn default<S>() -> S
453 137..149 'S::default()': S
454 159..161 's3': S
455 164..187 '<S as ...efault': fn default<S>() -> S
456 164..189 '<S as ...ault()': S
457 "#]],
458 );
459}
460
461#[test]
462fn infer_trait_assoc_method_generics_1() {
463 check_infer(
464 r#"
465 trait Trait<T> {
466 fn make() -> T;
467 }
468 struct S;
469 impl Trait<u32> for S {}
470 struct G<T>;
471 impl<T> Trait<T> for G<T> {}
472 fn test() {
473 let a = S::make();
474 let b = G::<u64>::make();
475 let c: f64 = G::make();
476 }
477 "#,
478 expect![[r#"
479 126..210 '{ ...e(); }': ()
480 136..137 'a': u32
481 140..147 'S::make': fn make<S, u32>() -> u32
482 140..149 'S::make()': u32
483 159..160 'b': u64
484 163..177 'G::<u64>::make': fn make<G<u64>, u64>() -> u64
485 163..179 'G::<u6...make()': u64
486 189..190 'c': f64
487 198..205 'G::make': fn make<G<f64>, f64>() -> f64
488 198..207 'G::make()': f64
489 "#]],
490 );
491}
492
493#[test]
494fn infer_trait_assoc_method_generics_2() {
495 check_infer(
496 r#"
497 trait Trait<T> {
498 fn make<U>() -> (T, U);
499 }
500 struct S;
501 impl Trait<u32> for S {}
502 struct G<T>;
503 impl<T> Trait<T> for G<T> {}
504 fn test() {
505 let a = S::make::<i64>();
506 let b: (_, i64) = S::make();
507 let c = G::<u32>::make::<i64>();
508 let d: (u32, _) = G::make::<i64>();
509 let e: (u32, i64) = G::make();
510 }
511 "#,
512 expect![[r#"
513 134..312 '{ ...e(); }': ()
514 144..145 'a': (u32, i64)
515 148..162 'S::make::<i64>': fn make<S, u32, i64>() -> (u32, i64)
516 148..164 'S::mak...i64>()': (u32, i64)
517 174..175 'b': (u32, i64)
518 188..195 'S::make': fn make<S, u32, i64>() -> (u32, i64)
519 188..197 'S::make()': (u32, i64)
520 207..208 'c': (u32, i64)
521 211..232 'G::<u3...:<i64>': fn make<G<u32>, u32, i64>() -> (u32, i64)
522 211..234 'G::<u3...i64>()': (u32, i64)
523 244..245 'd': (u32, i64)
524 258..272 'G::make::<i64>': fn make<G<u32>, u32, i64>() -> (u32, i64)
525 258..274 'G::mak...i64>()': (u32, i64)
526 284..285 'e': (u32, i64)
527 300..307 'G::make': fn make<G<u32>, u32, i64>() -> (u32, i64)
528 300..309 'G::make()': (u32, i64)
529 "#]],
530 );
531}
532
533#[test]
534fn infer_trait_assoc_method_generics_3() {
535 check_infer(
536 r#"
537 trait Trait<T> {
538 fn make() -> (Self, T);
539 }
540 struct S<T>;
541 impl Trait<i64> for S<i32> {}
542 fn test() {
543 let a = S::make();
544 }
545 "#,
546 expect![[r#"
547 100..126 '{ ...e(); }': ()
548 110..111 'a': (S<i32>, i64)
549 114..121 'S::make': fn make<S<i32>, i64>() -> (S<i32>, i64)
550 114..123 'S::make()': (S<i32>, i64)
551 "#]],
552 );
553}
554
555#[test]
556fn infer_trait_assoc_method_generics_4() {
557 check_infer(
558 r#"
559 trait Trait<T> {
560 fn make() -> (Self, T);
561 }
562 struct S<T>;
563 impl Trait<i64> for S<u64> {}
564 impl Trait<i32> for S<u32> {}
565 fn test() {
566 let a: (S<u64>, _) = S::make();
567 let b: (_, i32) = S::make();
568 }
569 "#,
570 expect![[r#"
571 130..202 '{ ...e(); }': ()
572 140..141 'a': (S<u64>, i64)
573 157..164 'S::make': fn make<S<u64>, i64>() -> (S<u64>, i64)
574 157..166 'S::make()': (S<u64>, i64)
575 176..177 'b': (S<u32>, i32)
576 190..197 'S::make': fn make<S<u32>, i32>() -> (S<u32>, i32)
577 190..199 'S::make()': (S<u32>, i32)
578 "#]],
579 );
580}
581
582#[test]
583fn infer_trait_assoc_method_generics_5() {
584 check_infer(
585 r#"
586 trait Trait<T> {
587 fn make<U>() -> (Self, T, U);
588 }
589 struct S<T>;
590 impl Trait<i64> for S<u64> {}
591 fn test() {
592 let a = <S as Trait<i64>>::make::<u8>();
593 let b: (S<u64>, _, _) = Trait::<i64>::make::<u8>();
594 }
595 "#,
596 expect![[r#"
597 106..210 '{ ...>(); }': ()
598 116..117 'a': (S<u64>, i64, u8)
599 120..149 '<S as ...::<u8>': fn make<S<u64>, i64, u8>() -> (S<u64>, i64, u8)
600 120..151 '<S as ...<u8>()': (S<u64>, i64, u8)
601 161..162 'b': (S<u64>, i64, u8)
602 181..205 'Trait:...::<u8>': fn make<S<u64>, i64, u8>() -> (S<u64>, i64, u8)
603 181..207 'Trait:...<u8>()': (S<u64>, i64, u8)
604 "#]],
605 );
606}
607
608#[test]
609fn infer_call_trait_method_on_generic_param_1() {
610 check_infer(
611 r#"
612 trait Trait {
613 fn method(&self) -> u32;
614 }
615 fn test<T: Trait>(t: T) {
616 t.method();
617 }
618 "#,
619 expect![[r#"
620 29..33 'self': &Self
621 63..64 't': T
622 69..88 '{ ...d(); }': ()
623 75..76 't': T
624 75..85 't.method()': u32
625 "#]],
626 );
627}
628
629#[test]
630fn infer_call_trait_method_on_generic_param_2() {
631 check_infer(
632 r#"
633 trait Trait<T> {
634 fn method(&self) -> T;
635 }
636 fn test<U, T: Trait<U>>(t: T) {
637 t.method();
638 }
639 "#,
640 expect![[r#"
641 32..36 'self': &Self
642 70..71 't': T
643 76..95 '{ ...d(); }': ()
644 82..83 't': T
645 82..92 't.method()': U
646 "#]],
647 );
648}
649
650#[test]
651fn infer_with_multiple_trait_impls() {
652 check_infer(
653 r#"
654 trait Into<T> {
655 fn into(self) -> T;
656 }
657 struct S;
658 impl Into<u32> for S {}
659 impl Into<u64> for S {}
660 fn test() {
661 let x: u32 = S.into();
662 let y: u64 = S.into();
663 let z = Into::<u64>::into(S);
664 }
665 "#,
666 expect![[r#"
667 28..32 'self': Self
668 110..201 '{ ...(S); }': ()
669 120..121 'x': u32
670 129..130 'S': S
671 129..137 'S.into()': u32
672 147..148 'y': u64
673 156..157 'S': S
674 156..164 'S.into()': u64
675 174..175 'z': u64
676 178..195 'Into::...::into': fn into<S, u64>(S) -> u64
677 178..198 'Into::...nto(S)': u64
678 196..197 'S': S
679 "#]],
680 );
681}
682
683#[test]
684fn method_resolution_unify_impl_self_type() {
685 check_types(
686 r#"
687struct S<T>;
688impl S<u32> { fn foo(&self) -> u8 {} }
689impl S<i32> { fn foo(&self) -> i8 {} }
690fn test() { (S::<u32>.foo(), S::<i32>.foo()); }
691 //^ (u8, i8)
692"#,
693 );
694}
695
696#[test]
697fn method_resolution_trait_before_autoref() {
698 check_types(
699 r#"
700trait Trait { fn foo(self) -> u128; }
701struct S;
702impl S { fn foo(&self) -> i8 { 0 } }
703impl Trait for S { fn foo(self) -> u128 { 0 } }
704fn test() { S.foo(); }
705 //^ u128
706"#,
707 );
708}
709
710#[test]
711fn method_resolution_by_value_before_autoref() {
712 check_types(
713 r#"
714trait Clone { fn clone(&self) -> Self; }
715struct S;
716impl Clone for S {}
717impl Clone for &S {}
718fn test() { (S.clone(), (&S).clone(), (&&S).clone()); }
719 //^ (S, S, &S)
720"#,
721 );
722}
723
724#[test]
725fn method_resolution_trait_before_autoderef() {
726 check_types(
727 r#"
728trait Trait { fn foo(self) -> u128; }
729struct S;
730impl S { fn foo(self) -> i8 { 0 } }
731impl Trait for &S { fn foo(self) -> u128 { 0 } }
732fn test() { (&S).foo(); }
733 //^ u128
734"#,
735 );
736}
737
738#[test]
739fn method_resolution_impl_before_trait() {
740 check_types(
741 r#"
742trait Trait { fn foo(self) -> u128; }
743struct S;
744impl S { fn foo(self) -> i8 { 0 } }
745impl Trait for S { fn foo(self) -> u128 { 0 } }
746fn test() { S.foo(); }
747 //^ i8
748"#,
749 );
750}
751
752#[test]
753fn method_resolution_impl_ref_before_trait() {
754 check_types(
755 r#"
756trait Trait { fn foo(self) -> u128; }
757struct S;
758impl S { fn foo(&self) -> i8 { 0 } }
759impl Trait for &S { fn foo(self) -> u128 { 0 } }
760fn test() { S.foo(); }
761 //^ i8
762"#,
763 );
764}
765
766#[test]
767fn method_resolution_trait_autoderef() {
768 check_types(
769 r#"
770trait Trait { fn foo(self) -> u128; }
771struct S;
772impl Trait for S { fn foo(self) -> u128 { 0 } }
773fn test() { (&S).foo(); }
774 //^ u128
775"#,
776 );
777}
778
779#[test]
780fn method_resolution_unsize_array() {
781 check_types(
782 r#"
783#[lang = "slice"]
784impl<T> [T] {
785 fn len(&self) -> usize { loop {} }
786}
787fn test() {
788 let a = [1, 2, 3];
789 a.len();
790} //^ usize
791"#,
792 );
793}
794
795#[test]
796fn method_resolution_trait_from_prelude() {
797 check_types(
798 r#"
799//- /main.rs crate:main deps:other_crate
800struct S;
801impl Clone for S {}
802
803fn test() {
804 S.clone();
805 //^ S
806}
807
808//- /lib.rs crate:other_crate
809#[prelude_import] use foo::*;
810
811mod foo {
812 trait Clone {
813 fn clone(&self) -> Self;
814 }
815}
816"#,
817 );
818}
819
820#[test]
821fn method_resolution_where_clause_for_unknown_trait() {
822 // The blanket impl currently applies because we ignore the unresolved where clause
823 check_types(
824 r#"
825trait Trait { fn foo(self) -> u128; }
826struct S;
827impl<T> Trait for T where T: UnknownTrait {}
828fn test() { (&S).foo(); }
829 //^ u128
830"#,
831 );
832}
833
834#[test]
835fn method_resolution_where_clause_not_met() {
836 // The blanket impl shouldn't apply because we can't prove S: Clone
837 // This is also to make sure that we don't resolve to the foo method just
838 // because that's the only method named foo we can find, which would make
839 // the below tests not work
840 check_types(
841 r#"
842trait Clone {}
843trait Trait { fn foo(self) -> u128; }
844struct S;
845impl<T> Trait for T where T: Clone {}
846fn test() { (&S).foo(); }
847 //^ {unknown}
848"#,
849 );
850}
851
852#[test]
853fn method_resolution_where_clause_inline_not_met() {
854 // The blanket impl shouldn't apply because we can't prove S: Clone
855 check_types(
856 r#"
857trait Clone {}
858trait Trait { fn foo(self) -> u128; }
859struct S;
860impl<T: Clone> Trait for T {}
861fn test() { (&S).foo(); }
862 //^ {unknown}
863"#,
864 );
865}
866
867#[test]
868fn method_resolution_where_clause_1() {
869 check_types(
870 r#"
871trait Clone {}
872trait Trait { fn foo(self) -> u128; }
873struct S;
874impl Clone for S {}
875impl<T> Trait for T where T: Clone {}
876fn test() { S.foo(); }
877 //^ u128
878"#,
879 );
880}
881
882#[test]
883fn method_resolution_where_clause_2() {
884 check_types(
885 r#"
886trait Into<T> { fn into(self) -> T; }
887trait From<T> { fn from(other: T) -> Self; }
888struct S1;
889struct S2;
890impl From<S2> for S1 {}
891impl<T, U> Into<U> for T where U: From<T> {}
892fn test() { S2.into(); }
893 //^ {unknown}
894"#,
895 );
896}
897
898#[test]
899fn method_resolution_where_clause_inline() {
900 check_types(
901 r#"
902trait Into<T> { fn into(self) -> T; }
903trait From<T> { fn from(other: T) -> Self; }
904struct S1;
905struct S2;
906impl From<S2> for S1 {}
907impl<T, U: From<T>> Into<U> for T {}
908fn test() { S2.into(); }
909 //^ {unknown}
910"#,
911 );
912}
913
914#[test]
915fn method_resolution_overloaded_method() {
916 test_utils::mark::check!(impl_self_type_match_without_receiver);
917 check_types(
918 r#"
919struct Wrapper<T>(T);
920struct Foo<T>(T);
921struct Bar<T>(T);
922
923impl<T> Wrapper<Foo<T>> {
924 pub fn new(foo_: T) -> Self {
925 Wrapper(Foo(foo_))
926 }
927}
928
929impl<T> Wrapper<Bar<T>> {
930 pub fn new(bar_: T) -> Self {
931 Wrapper(Bar(bar_))
932 }
933}
934
935fn main() {
936 let a = Wrapper::<Foo<f32>>::new(1.0);
937 let b = Wrapper::<Bar<f32>>::new(1.0);
938 (a, b);
939 //^ (Wrapper<Foo<f32>>, Wrapper<Bar<f32>>)
940}
941"#,
942 );
943}
944
945#[test]
946fn method_resolution_encountering_fn_type() {
947 check_types(
948 r#"
949//- /main.rs
950fn foo() {}
951trait FnOnce { fn call(self); }
952fn test() { foo.call(); }
953 //^ {unknown}
954"#,
955 );
956}
957
958#[test]
959fn method_resolution_non_parameter_type() {
960 check_types(
961 r#"
962mod a {
963 pub trait Foo {
964 fn foo(&self);
965 }
966}
967
968struct Wrapper<T>(T);
969fn foo<T>(t: Wrapper<T>)
970where
971 Wrapper<T>: a::Foo,
972{
973 t.foo();
974} //^ {unknown}
975"#,
976 );
977}
978
979#[test]
980fn method_resolution_3373() {
981 check_types(
982 r#"
983struct A<T>(T);
984
985impl A<i32> {
986 fn from(v: i32) -> A<i32> { A(v) }
987}
988
989fn main() {
990 A::from(3);
991} //^ A<i32>
992"#,
993 );
994}
995
996#[test]
997fn method_resolution_slow() {
998 // this can get quite slow if we set the solver size limit too high
999 check_types(
1000 r#"
1001trait SendX {}
1002
1003struct S1; impl SendX for S1 {}
1004struct S2; impl SendX for S2 {}
1005struct U1;
1006
1007trait Trait { fn method(self); }
1008
1009struct X1<A, B> {}
1010impl<A, B> SendX for X1<A, B> where A: SendX, B: SendX {}
1011
1012struct S<B, C> {}
1013
1014trait FnX {}
1015
1016impl<B, C> Trait for S<B, C> where C: FnX, B: SendX {}
1017
1018fn test() { (S {}).method(); }
1019 //^ ()
1020"#,
1021 );
1022}
1023
1024#[test]
1025fn dyn_trait_super_trait_not_in_scope() {
1026 check_infer(
1027 r#"
1028 mod m {
1029 pub trait SuperTrait {
1030 fn foo(&self) -> u32 { 0 }
1031 }
1032 }
1033 trait Trait: m::SuperTrait {}
1034
1035 struct S;
1036 impl m::SuperTrait for S {}
1037 impl Trait for S {}
1038
1039 fn test(d: &dyn Trait) {
1040 d.foo();
1041 }
1042 "#,
1043 expect![[r#"
1044 51..55 'self': &Self
1045 64..69 '{ 0 }': u32
1046 66..67 '0': u32
1047 176..177 'd': &dyn Trait
1048 191..207 '{ ...o(); }': ()
1049 197..198 'd': &dyn Trait
1050 197..204 'd.foo()': u32
1051 "#]],
1052 );
1053}
diff --git a/crates/hir_ty/src/tests/never_type.rs b/crates/hir_ty/src/tests/never_type.rs
new file mode 100644
index 000000000..335c474df
--- /dev/null
+++ b/crates/hir_ty/src/tests/never_type.rs
@@ -0,0 +1,409 @@
1use expect_test::expect;
2
3use super::{check_infer_with_mismatches, check_types};
4
5#[test]
6fn infer_never1() {
7 check_types(
8 r#"
9fn test() {
10 let t = return;
11 t;
12} //^ !
13"#,
14 );
15}
16
17#[test]
18fn infer_never2() {
19 check_types(
20 r#"
21fn gen<T>() -> T { loop {} }
22
23fn test() {
24 let a = gen();
25 if false { a } else { loop {} };
26 a;
27} //^ !
28"#,
29 );
30}
31
32#[test]
33fn infer_never3() {
34 check_types(
35 r#"
36fn gen<T>() -> T { loop {} }
37
38fn test() {
39 let a = gen();
40 if false { loop {} } else { a };
41 a;
42 //^ !
43}
44"#,
45 );
46}
47
48#[test]
49fn never_type_in_generic_args() {
50 check_types(
51 r#"
52enum Option<T> { None, Some(T) }
53
54fn test() {
55 let a = if true { Option::None } else { Option::Some(return) };
56 a;
57} //^ Option<!>
58"#,
59 );
60}
61
62#[test]
63fn never_type_can_be_reinferred1() {
64 check_types(
65 r#"
66fn gen<T>() -> T { loop {} }
67
68fn test() {
69 let a = gen();
70 if false { loop {} } else { a };
71 a;
72 //^ ()
73 if false { a };
74}
75"#,
76 );
77}
78
79#[test]
80fn never_type_can_be_reinferred2() {
81 check_types(
82 r#"
83enum Option<T> { None, Some(T) }
84
85fn test() {
86 let a = if true { Option::None } else { Option::Some(return) };
87 a;
88 //^ Option<i32>
89 match 42 {
90 42 => a,
91 _ => Option::Some(42),
92 };
93}
94"#,
95 );
96}
97
98#[test]
99fn never_type_can_be_reinferred3() {
100 check_types(
101 r#"
102enum Option<T> { None, Some(T) }
103
104fn test() {
105 let a = if true { Option::None } else { Option::Some(return) };
106 a;
107 //^ Option<&str>
108 match 42 {
109 42 => a,
110 _ => Option::Some("str"),
111 };
112}
113"#,
114 );
115}
116
117#[test]
118fn match_no_arm() {
119 check_types(
120 r#"
121enum Void {}
122
123fn test(a: Void) {
124 let t = match a {};
125 t;
126} //^ !
127"#,
128 );
129}
130
131#[test]
132fn match_unknown_arm() {
133 check_types(
134 r#"
135fn test(a: Option) {
136 let t = match 0 {
137 _ => unknown,
138 };
139 t;
140} //^ {unknown}
141"#,
142 );
143}
144
145#[test]
146fn if_never() {
147 check_types(
148 r#"
149fn test() {
150 let i = if true {
151 loop {}
152 } else {
153 3.0
154 };
155 i;
156} //^ f64
157"#,
158 );
159}
160
161#[test]
162fn if_else_never() {
163 check_types(
164 r#"
165fn test(input: bool) {
166 let i = if input {
167 2.0
168 } else {
169 return
170 };
171 i;
172} //^ f64
173"#,
174 );
175}
176
177#[test]
178fn match_first_arm_never() {
179 check_types(
180 r#"
181fn test(a: i32) {
182 let i = match a {
183 1 => return,
184 2 => 2.0,
185 3 => loop {},
186 _ => 3.0,
187 };
188 i;
189} //^ f64
190"#,
191 );
192}
193
194#[test]
195fn match_second_arm_never() {
196 check_types(
197 r#"
198fn test(a: i32) {
199 let i = match a {
200 1 => 3.0,
201 2 => loop {},
202 3 => 3.0,
203 _ => return,
204 };
205 i;
206} //^ f64
207"#,
208 );
209}
210
211#[test]
212fn match_all_arms_never() {
213 check_types(
214 r#"
215fn test(a: i32) {
216 let i = match a {
217 2 => return,
218 _ => loop {},
219 };
220 i;
221} //^ !
222"#,
223 );
224}
225
226#[test]
227fn match_no_never_arms() {
228 check_types(
229 r#"
230fn test(a: i32) {
231 let i = match a {
232 2 => 2.0,
233 _ => 3.0,
234 };
235 i;
236} //^ f64
237"#,
238 );
239}
240
241#[test]
242fn diverging_expression_1() {
243 check_infer_with_mismatches(
244 r"
245 //- /main.rs
246 fn test1() {
247 let x: u32 = return;
248 }
249 fn test2() {
250 let x: u32 = { return; };
251 }
252 fn test3() {
253 let x: u32 = loop {};
254 }
255 fn test4() {
256 let x: u32 = { loop {} };
257 }
258 fn test5() {
259 let x: u32 = { if true { loop {}; } else { loop {}; } };
260 }
261 fn test6() {
262 let x: u32 = { let y: u32 = { loop {}; }; };
263 }
264 ",
265 expect![[r"
266 11..39 '{ ...urn; }': ()
267 21..22 'x': u32
268 30..36 'return': !
269 51..84 '{ ...; }; }': ()
270 61..62 'x': u32
271 70..81 '{ return; }': u32
272 72..78 'return': !
273 96..125 '{ ... {}; }': ()
274 106..107 'x': u32
275 115..122 'loop {}': !
276 120..122 '{}': ()
277 137..170 '{ ...} }; }': ()
278 147..148 'x': u32
279 156..167 '{ loop {} }': u32
280 158..165 'loop {}': !
281 163..165 '{}': ()
282 182..246 '{ ...} }; }': ()
283 192..193 'x': u32
284 201..243 '{ if t...}; } }': u32
285 203..241 'if tru... {}; }': u32
286 206..210 'true': bool
287 211..223 '{ loop {}; }': u32
288 213..220 'loop {}': !
289 218..220 '{}': ()
290 229..241 '{ loop {}; }': u32
291 231..238 'loop {}': !
292 236..238 '{}': ()
293 258..310 '{ ...; }; }': ()
294 268..269 'x': u32
295 277..307 '{ let ...; }; }': u32
296 283..284 'y': u32
297 292..304 '{ loop {}; }': u32
298 294..301 'loop {}': !
299 299..301 '{}': ()
300 "]],
301 );
302}
303
304#[test]
305fn diverging_expression_2() {
306 check_infer_with_mismatches(
307 r#"
308 //- /main.rs
309 fn test1() {
310 // should give type mismatch
311 let x: u32 = { loop {}; "foo" };
312 }
313 "#,
314 expect![[r#"
315 11..84 '{ ..." }; }': ()
316 54..55 'x': u32
317 63..81 '{ loop...foo" }': &str
318 65..72 'loop {}': !
319 70..72 '{}': ()
320 74..79 '"foo"': &str
321 63..81: expected u32, got &str
322 74..79: expected u32, got &str
323 "#]],
324 );
325}
326
327#[test]
328fn diverging_expression_3_break() {
329 check_infer_with_mismatches(
330 r"
331 //- /main.rs
332 fn test1() {
333 // should give type mismatch
334 let x: u32 = { loop { break; } };
335 }
336 fn test2() {
337 // should give type mismatch
338 let x: u32 = { for a in b { break; }; };
339 // should give type mismatch as well
340 let x: u32 = { for a in b {}; };
341 // should give type mismatch as well
342 let x: u32 = { for a in b { return; }; };
343 }
344 fn test3() {
345 // should give type mismatch
346 let x: u32 = { while true { break; }; };
347 // should give type mismatch as well -- there's an implicit break, even if it's never hit
348 let x: u32 = { while true {}; };
349 // should give type mismatch as well
350 let x: u32 = { while true { return; }; };
351 }
352 ",
353 expect![[r"
354 11..85 '{ ...} }; }': ()
355 54..55 'x': u32
356 63..82 '{ loop...k; } }': ()
357 65..80 'loop { break; }': ()
358 70..80 '{ break; }': ()
359 72..77 'break': !
360 63..82: expected u32, got ()
361 65..80: expected u32, got ()
362 97..343 '{ ...; }; }': ()
363 140..141 'x': u32
364 149..175 '{ for ...; }; }': ()
365 151..172 'for a ...eak; }': ()
366 155..156 'a': {unknown}
367 160..161 'b': {unknown}
368 162..172 '{ break; }': ()
369 164..169 'break': !
370 226..227 'x': u32
371 235..253 '{ for ... {}; }': ()
372 237..250 'for a in b {}': ()
373 241..242 'a': {unknown}
374 246..247 'b': {unknown}
375 248..250 '{}': ()
376 304..305 'x': u32
377 313..340 '{ for ...; }; }': ()
378 315..337 'for a ...urn; }': ()
379 319..320 'a': {unknown}
380 324..325 'b': {unknown}
381 326..337 '{ return; }': ()
382 328..334 'return': !
383 149..175: expected u32, got ()
384 235..253: expected u32, got ()
385 313..340: expected u32, got ()
386 355..654 '{ ...; }; }': ()
387 398..399 'x': u32
388 407..433 '{ whil...; }; }': ()
389 409..430 'while ...eak; }': ()
390 415..419 'true': bool
391 420..430 '{ break; }': ()
392 422..427 'break': !
393 537..538 'x': u32
394 546..564 '{ whil... {}; }': ()
395 548..561 'while true {}': ()
396 554..558 'true': bool
397 559..561 '{}': ()
398 615..616 'x': u32
399 624..651 '{ whil...; }; }': ()
400 626..648 'while ...urn; }': ()
401 632..636 'true': bool
402 637..648 '{ return; }': ()
403 639..645 'return': !
404 407..433: expected u32, got ()
405 546..564: expected u32, got ()
406 624..651: expected u32, got ()
407 "]],
408 );
409}
diff --git a/crates/hir_ty/src/tests/patterns.rs b/crates/hir_ty/src/tests/patterns.rs
new file mode 100644
index 000000000..aeb191c79
--- /dev/null
+++ b/crates/hir_ty/src/tests/patterns.rs
@@ -0,0 +1,656 @@
1use expect_test::expect;
2use test_utils::mark;
3
4use super::{check_infer, check_infer_with_mismatches};
5
6#[test]
7fn infer_pattern() {
8 check_infer(
9 r#"
10 fn test(x: &i32) {
11 let y = x;
12 let &z = x;
13 let a = z;
14 let (c, d) = (1, "hello");
15
16 for (e, f) in some_iter {
17 let g = e;
18 }
19
20 if let [val] = opt {
21 let h = val;
22 }
23
24 let lambda = |a: u64, b, c: i32| { a + b; c };
25
26 let ref ref_to_x = x;
27 let mut mut_x = x;
28 let ref mut mut_ref_to_x = x;
29 let k = mut_ref_to_x;
30 }
31 "#,
32 expect![[r#"
33 8..9 'x': &i32
34 17..368 '{ ...o_x; }': ()
35 27..28 'y': &i32
36 31..32 'x': &i32
37 42..44 '&z': &i32
38 43..44 'z': i32
39 47..48 'x': &i32
40 58..59 'a': i32
41 62..63 'z': i32
42 73..79 '(c, d)': (i32, &str)
43 74..75 'c': i32
44 77..78 'd': &str
45 82..94 '(1, "hello")': (i32, &str)
46 83..84 '1': i32
47 86..93 '"hello"': &str
48 101..151 'for (e... }': ()
49 105..111 '(e, f)': ({unknown}, {unknown})
50 106..107 'e': {unknown}
51 109..110 'f': {unknown}
52 115..124 'some_iter': {unknown}
53 125..151 '{ ... }': ()
54 139..140 'g': {unknown}
55 143..144 'e': {unknown}
56 157..204 'if let... }': ()
57 164..169 '[val]': [{unknown}]
58 165..168 'val': {unknown}
59 172..175 'opt': [{unknown}]
60 176..204 '{ ... }': ()
61 190..191 'h': {unknown}
62 194..197 'val': {unknown}
63 214..220 'lambda': |u64, u64, i32| -> i32
64 223..255 '|a: u6...b; c }': |u64, u64, i32| -> i32
65 224..225 'a': u64
66 232..233 'b': u64
67 235..236 'c': i32
68 243..255 '{ a + b; c }': i32
69 245..246 'a': u64
70 245..250 'a + b': u64
71 249..250 'b': u64
72 252..253 'c': i32
73 266..278 'ref ref_to_x': &&i32
74 281..282 'x': &i32
75 292..301 'mut mut_x': &i32
76 304..305 'x': &i32
77 315..335 'ref mu...f_to_x': &mut &i32
78 338..339 'x': &i32
79 349..350 'k': &mut &i32
80 353..365 'mut_ref_to_x': &mut &i32
81 "#]],
82 );
83}
84
85#[test]
86fn infer_literal_pattern() {
87 check_infer_with_mismatches(
88 r#"
89 fn any<T>() -> T { loop {} }
90 fn test(x: &i32) {
91 if let "foo" = any() {}
92 if let 1 = any() {}
93 if let 1u32 = any() {}
94 if let 1f32 = any() {}
95 if let 1.0 = any() {}
96 if let true = any() {}
97 }
98 "#,
99 expect![[r#"
100 17..28 '{ loop {} }': T
101 19..26 'loop {}': !
102 24..26 '{}': ()
103 37..38 'x': &i32
104 46..208 '{ ...) {} }': ()
105 52..75 'if let...y() {}': ()
106 59..64 '"foo"': &str
107 59..64 '"foo"': &str
108 67..70 'any': fn any<&str>() -> &str
109 67..72 'any()': &str
110 73..75 '{}': ()
111 80..99 'if let...y() {}': ()
112 87..88 '1': i32
113 87..88 '1': i32
114 91..94 'any': fn any<i32>() -> i32
115 91..96 'any()': i32
116 97..99 '{}': ()
117 104..126 'if let...y() {}': ()
118 111..115 '1u32': u32
119 111..115 '1u32': u32
120 118..121 'any': fn any<u32>() -> u32
121 118..123 'any()': u32
122 124..126 '{}': ()
123 131..153 'if let...y() {}': ()
124 138..142 '1f32': f32
125 138..142 '1f32': f32
126 145..148 'any': fn any<f32>() -> f32
127 145..150 'any()': f32
128 151..153 '{}': ()
129 158..179 'if let...y() {}': ()
130 165..168 '1.0': f64
131 165..168 '1.0': f64
132 171..174 'any': fn any<f64>() -> f64
133 171..176 'any()': f64
134 177..179 '{}': ()
135 184..206 'if let...y() {}': ()
136 191..195 'true': bool
137 191..195 'true': bool
138 198..201 'any': fn any<bool>() -> bool
139 198..203 'any()': bool
140 204..206 '{}': ()
141 "#]],
142 );
143}
144
145#[test]
146fn infer_range_pattern() {
147 check_infer_with_mismatches(
148 r#"
149 fn test(x: &i32) {
150 if let 1..76 = 2u32 {}
151 if let 1..=76 = 2u32 {}
152 }
153 "#,
154 expect![[r#"
155 8..9 'x': &i32
156 17..75 '{ ...2 {} }': ()
157 23..45 'if let...u32 {}': ()
158 30..35 '1..76': u32
159 38..42 '2u32': u32
160 43..45 '{}': ()
161 50..73 'if let...u32 {}': ()
162 57..63 '1..=76': u32
163 66..70 '2u32': u32
164 71..73 '{}': ()
165 "#]],
166 );
167}
168
169#[test]
170fn infer_pattern_match_ergonomics() {
171 check_infer(
172 r#"
173 struct A<T>(T);
174
175 fn test() {
176 let A(n) = &A(1);
177 let A(n) = &mut A(1);
178 }
179 "#,
180 expect![[r#"
181 27..78 '{ ...(1); }': ()
182 37..41 'A(n)': A<i32>
183 39..40 'n': &i32
184 44..49 '&A(1)': &A<i32>
185 45..46 'A': A<i32>(i32) -> A<i32>
186 45..49 'A(1)': A<i32>
187 47..48 '1': i32
188 59..63 'A(n)': A<i32>
189 61..62 'n': &mut i32
190 66..75 '&mut A(1)': &mut A<i32>
191 71..72 'A': A<i32>(i32) -> A<i32>
192 71..75 'A(1)': A<i32>
193 73..74 '1': i32
194 "#]],
195 );
196}
197
198#[test]
199fn infer_pattern_match_ergonomics_ref() {
200 mark::check!(match_ergonomics_ref);
201 check_infer(
202 r#"
203 fn test() {
204 let v = &(1, &2);
205 let (_, &w) = v;
206 }
207 "#,
208 expect![[r#"
209 10..56 '{ ...= v; }': ()
210 20..21 'v': &(i32, &i32)
211 24..32 '&(1, &2)': &(i32, &i32)
212 25..32 '(1, &2)': (i32, &i32)
213 26..27 '1': i32
214 29..31 '&2': &i32
215 30..31 '2': i32
216 42..49 '(_, &w)': (i32, &i32)
217 43..44 '_': i32
218 46..48 '&w': &i32
219 47..48 'w': i32
220 52..53 'v': &(i32, &i32)
221 "#]],
222 );
223}
224
225#[test]
226fn infer_pattern_match_slice() {
227 check_infer(
228 r#"
229 fn test() {
230 let slice: &[f64] = &[0.0];
231 match slice {
232 &[] => {},
233 &[a] => {
234 a;
235 },
236 &[b, c] => {
237 b;
238 c;
239 }
240 _ => {}
241 }
242 }
243 "#,
244 expect![[r#"
245 10..209 '{ ... } }': ()
246 20..25 'slice': &[f64]
247 36..42 '&[0.0]': &[f64; _]
248 37..42 '[0.0]': [f64; _]
249 38..41 '0.0': f64
250 48..207 'match ... }': ()
251 54..59 'slice': &[f64]
252 70..73 '&[]': &[f64]
253 71..73 '[]': [f64]
254 77..79 '{}': ()
255 89..93 '&[a]': &[f64]
256 90..93 '[a]': [f64]
257 91..92 'a': f64
258 97..123 '{ ... }': ()
259 111..112 'a': f64
260 133..140 '&[b, c]': &[f64]
261 134..140 '[b, c]': [f64]
262 135..136 'b': f64
263 138..139 'c': f64
264 144..185 '{ ... }': ()
265 158..159 'b': f64
266 173..174 'c': f64
267 194..195 '_': &[f64]
268 199..201 '{}': ()
269 "#]],
270 );
271}
272
273#[test]
274fn infer_pattern_match_string_literal() {
275 check_infer_with_mismatches(
276 r#"
277 fn test() {
278 let s: &str = "hello";
279 match s {
280 "hello" => {}
281 _ => {}
282 }
283 }
284 "#,
285 expect![[r#"
286 10..98 '{ ... } }': ()
287 20..21 's': &str
288 30..37 '"hello"': &str
289 43..96 'match ... }': ()
290 49..50 's': &str
291 61..68 '"hello"': &str
292 61..68 '"hello"': &str
293 72..74 '{}': ()
294 83..84 '_': &str
295 88..90 '{}': ()
296 "#]],
297 );
298}
299
300#[test]
301fn infer_pattern_match_or() {
302 check_infer_with_mismatches(
303 r#"
304 fn test() {
305 let s: &str = "hello";
306 match s {
307 "hello" | "world" => {}
308 _ => {}
309 }
310 }
311 "#,
312 expect![[r#"
313 10..108 '{ ... } }': ()
314 20..21 's': &str
315 30..37 '"hello"': &str
316 43..106 'match ... }': ()
317 49..50 's': &str
318 61..68 '"hello"': &str
319 61..68 '"hello"': &str
320 61..78 '"hello...world"': &str
321 71..78 '"world"': &str
322 71..78 '"world"': &str
323 82..84 '{}': ()
324 93..94 '_': &str
325 98..100 '{}': ()
326 "#]],
327 );
328}
329
330#[test]
331fn infer_pattern_match_arr() {
332 check_infer(
333 r#"
334 fn test() {
335 let arr: [f64; 2] = [0.0, 1.0];
336 match arr {
337 [1.0, a] => {
338 a;
339 },
340 [b, c] => {
341 b;
342 c;
343 }
344 }
345 }
346 "#,
347 expect![[r#"
348 10..179 '{ ... } }': ()
349 20..23 'arr': [f64; _]
350 36..46 '[0.0, 1.0]': [f64; _]
351 37..40 '0.0': f64
352 42..45 '1.0': f64
353 52..177 'match ... }': ()
354 58..61 'arr': [f64; _]
355 72..80 '[1.0, a]': [f64; _]
356 73..76 '1.0': f64
357 73..76 '1.0': f64
358 78..79 'a': f64
359 84..110 '{ ... }': ()
360 98..99 'a': f64
361 120..126 '[b, c]': [f64; _]
362 121..122 'b': f64
363 124..125 'c': f64
364 130..171 '{ ... }': ()
365 144..145 'b': f64
366 159..160 'c': f64
367 "#]],
368 );
369}
370
371#[test]
372fn infer_adt_pattern() {
373 check_infer(
374 r#"
375 enum E {
376 A { x: usize },
377 B
378 }
379
380 struct S(u32, E);
381
382 fn test() {
383 let e = E::A { x: 3 };
384
385 let S(y, z) = foo;
386 let E::A { x: new_var } = e;
387
388 match e {
389 E::A { x } => x,
390 E::B if foo => 1,
391 E::B => 10,
392 };
393
394 let ref d @ E::A { .. } = e;
395 d;
396 }
397 "#,
398 expect![[r#"
399 67..288 '{ ... d; }': ()
400 77..78 'e': E
401 81..94 'E::A { x: 3 }': E
402 91..92 '3': usize
403 105..112 'S(y, z)': S
404 107..108 'y': u32
405 110..111 'z': E
406 115..118 'foo': S
407 128..147 'E::A {..._var }': E
408 138..145 'new_var': usize
409 150..151 'e': E
410 158..244 'match ... }': usize
411 164..165 'e': E
412 176..186 'E::A { x }': E
413 183..184 'x': usize
414 190..191 'x': usize
415 201..205 'E::B': E
416 209..212 'foo': bool
417 216..217 '1': usize
418 227..231 'E::B': E
419 235..237 '10': usize
420 255..274 'ref d ...{ .. }': &E
421 263..274 'E::A { .. }': E
422 277..278 'e': E
423 284..285 'd': &E
424 "#]],
425 );
426}
427
428#[test]
429fn enum_variant_through_self_in_pattern() {
430 check_infer(
431 r#"
432 enum E {
433 A { x: usize },
434 B(usize),
435 C
436 }
437
438 impl E {
439 fn test() {
440 match (loop {}) {
441 Self::A { x } => { x; },
442 Self::B(x) => { x; },
443 Self::C => {},
444 };
445 }
446 }
447 "#,
448 expect![[r#"
449 75..217 '{ ... }': ()
450 85..210 'match ... }': ()
451 92..99 'loop {}': !
452 97..99 '{}': ()
453 115..128 'Self::A { x }': E
454 125..126 'x': usize
455 132..138 '{ x; }': ()
456 134..135 'x': usize
457 152..162 'Self::B(x)': E
458 160..161 'x': usize
459 166..172 '{ x; }': ()
460 168..169 'x': usize
461 186..193 'Self::C': E
462 197..199 '{}': ()
463 "#]],
464 );
465}
466
467#[test]
468fn infer_generics_in_patterns() {
469 check_infer(
470 r#"
471 struct A<T> {
472 x: T,
473 }
474
475 enum Option<T> {
476 Some(T),
477 None,
478 }
479
480 fn test(a1: A<u32>, o: Option<u64>) {
481 let A { x: x2 } = a1;
482 let A::<i64> { x: x3 } = A { x: 1 };
483 match o {
484 Option::Some(t) => t,
485 _ => 1,
486 };
487 }
488 "#,
489 expect![[r#"
490 78..80 'a1': A<u32>
491 90..91 'o': Option<u64>
492 106..243 '{ ... }; }': ()
493 116..127 'A { x: x2 }': A<u32>
494 123..125 'x2': u32
495 130..132 'a1': A<u32>
496 142..160 'A::<i6...: x3 }': A<i64>
497 156..158 'x3': i64
498 163..173 'A { x: 1 }': A<i64>
499 170..171 '1': i64
500 179..240 'match ... }': u64
501 185..186 'o': Option<u64>
502 197..212 'Option::Some(t)': Option<u64>
503 210..211 't': u64
504 216..217 't': u64
505 227..228 '_': Option<u64>
506 232..233 '1': u64
507 "#]],
508 );
509}
510
511#[test]
512fn infer_const_pattern() {
513 check_infer_with_mismatches(
514 r#"
515 enum Option<T> { None }
516 use Option::None;
517 struct Foo;
518 const Bar: usize = 1;
519
520 fn test() {
521 let a: Option<u32> = None;
522 let b: Option<i64> = match a {
523 None => None,
524 };
525 let _: () = match () { Foo => Foo }; // Expected mismatch
526 let _: () = match () { Bar => Bar }; // Expected mismatch
527 }
528 "#,
529 expect![[r#"
530 73..74 '1': usize
531 87..309 '{ ...atch }': ()
532 97..98 'a': Option<u32>
533 114..118 'None': Option<u32>
534 128..129 'b': Option<i64>
535 145..182 'match ... }': Option<i64>
536 151..152 'a': Option<u32>
537 163..167 'None': Option<u32>
538 171..175 'None': Option<i64>
539 192..193 '_': ()
540 200..223 'match ... Foo }': Foo
541 206..208 '()': ()
542 211..214 'Foo': Foo
543 218..221 'Foo': Foo
544 254..255 '_': ()
545 262..285 'match ... Bar }': usize
546 268..270 '()': ()
547 273..276 'Bar': usize
548 280..283 'Bar': usize
549 200..223: expected (), got Foo
550 262..285: expected (), got usize
551 "#]],
552 );
553}
554
555#[test]
556fn infer_guard() {
557 check_infer(
558 r#"
559struct S;
560impl S { fn foo(&self) -> bool { false } }
561
562fn main() {
563 match S {
564 s if s.foo() => (),
565 }
566}
567 "#,
568 expect![[r#"
569 27..31 'self': &S
570 41..50 '{ false }': bool
571 43..48 'false': bool
572 64..115 '{ ... } }': ()
573 70..113 'match ... }': ()
574 76..77 'S': S
575 88..89 's': S
576 93..94 's': S
577 93..100 's.foo()': bool
578 104..106 '()': ()
579 "#]],
580 )
581}
582
583#[test]
584fn match_ergonomics_in_closure_params() {
585 check_infer(
586 r#"
587 #[lang = "fn_once"]
588 trait FnOnce<Args> {
589 type Output;
590 }
591
592 fn foo<T, U, F: FnOnce(T) -> U>(t: T, f: F) -> U { loop {} }
593
594 fn test() {
595 foo(&(1, "a"), |&(x, y)| x); // normal, no match ergonomics
596 foo(&(1, "a"), |(x, y)| x);
597 }
598 "#,
599 expect![[r#"
600 93..94 't': T
601 99..100 'f': F
602 110..121 '{ loop {} }': U
603 112..119 'loop {}': !
604 117..119 '{}': ()
605 133..232 '{ ... x); }': ()
606 139..142 'foo': fn foo<&(i32, &str), i32, |&(i32, &str)| -> i32>(&(i32, &str), |&(i32, &str)| -> i32) -> i32
607 139..166 'foo(&(...y)| x)': i32
608 143..152 '&(1, "a")': &(i32, &str)
609 144..152 '(1, "a")': (i32, &str)
610 145..146 '1': i32
611 148..151 '"a"': &str
612 154..165 '|&(x, y)| x': |&(i32, &str)| -> i32
613 155..162 '&(x, y)': &(i32, &str)
614 156..162 '(x, y)': (i32, &str)
615 157..158 'x': i32
616 160..161 'y': &str
617 164..165 'x': i32
618 203..206 'foo': fn foo<&(i32, &str), &i32, |&(i32, &str)| -> &i32>(&(i32, &str), |&(i32, &str)| -> &i32) -> &i32
619 203..229 'foo(&(...y)| x)': &i32
620 207..216 '&(1, "a")': &(i32, &str)
621 208..216 '(1, "a")': (i32, &str)
622 209..210 '1': i32
623 212..215 '"a"': &str
624 218..228 '|(x, y)| x': |&(i32, &str)| -> &i32
625 219..225 '(x, y)': (i32, &str)
626 220..221 'x': &i32
627 223..224 'y': &&str
628 227..228 'x': &i32
629 "#]],
630 );
631}
632
633#[test]
634fn slice_tail_pattern() {
635 check_infer(
636 r#"
637 fn foo(params: &[i32]) {
638 match params {
639 [head, tail @ ..] => {
640 }
641 }
642 }
643 "#,
644 expect![[r#"
645 7..13 'params': &[i32]
646 23..92 '{ ... } }': ()
647 29..90 'match ... }': ()
648 35..41 'params': &[i32]
649 52..69 '[head,... @ ..]': [i32]
650 53..57 'head': &i32
651 59..68 'tail @ ..': &[i32]
652 66..68 '..': [i32]
653 73..84 '{ }': ()
654 "#]],
655 );
656}
diff --git a/crates/hir_ty/src/tests/regression.rs b/crates/hir_ty/src/tests/regression.rs
new file mode 100644
index 000000000..94d86b0d1
--- /dev/null
+++ b/crates/hir_ty/src/tests/regression.rs
@@ -0,0 +1,842 @@
1use expect_test::expect;
2use test_utils::mark;
3
4use super::{check_infer, check_types};
5
6#[test]
7fn bug_484() {
8 check_infer(
9 r#"
10 fn test() {
11 let x = if true {};
12 }
13 "#,
14 expect![[r#"
15 10..37 '{ ... {}; }': ()
16 20..21 'x': ()
17 24..34 'if true {}': ()
18 27..31 'true': bool
19 32..34 '{}': ()
20 "#]],
21 );
22}
23
24#[test]
25fn no_panic_on_field_of_enum() {
26 check_infer(
27 r#"
28 enum X {}
29
30 fn test(x: X) {
31 x.some_field;
32 }
33 "#,
34 expect![[r#"
35 19..20 'x': X
36 25..46 '{ ...eld; }': ()
37 31..32 'x': X
38 31..43 'x.some_field': {unknown}
39 "#]],
40 );
41}
42
43#[test]
44fn bug_585() {
45 check_infer(
46 r#"
47 fn test() {
48 X {};
49 match x {
50 A::B {} => (),
51 A::Y() => (),
52 }
53 }
54 "#,
55 expect![[r#"
56 10..88 '{ ... } }': ()
57 16..20 'X {}': {unknown}
58 26..86 'match ... }': ()
59 32..33 'x': {unknown}
60 44..51 'A::B {}': {unknown}
61 55..57 '()': ()
62 67..73 'A::Y()': {unknown}
63 77..79 '()': ()
64 "#]],
65 );
66}
67
68#[test]
69fn bug_651() {
70 check_infer(
71 r#"
72 fn quux() {
73 let y = 92;
74 1 + y;
75 }
76 "#,
77 expect![[r#"
78 10..40 '{ ...+ y; }': ()
79 20..21 'y': i32
80 24..26 '92': i32
81 32..33 '1': i32
82 32..37 '1 + y': i32
83 36..37 'y': i32
84 "#]],
85 );
86}
87
88#[test]
89fn recursive_vars() {
90 mark::check!(type_var_cycles_resolve_completely);
91 mark::check!(type_var_cycles_resolve_as_possible);
92 check_infer(
93 r#"
94 fn test() {
95 let y = unknown;
96 [y, &y];
97 }
98 "#,
99 expect![[r#"
100 10..47 '{ ...&y]; }': ()
101 20..21 'y': &{unknown}
102 24..31 'unknown': &{unknown}
103 37..44 '[y, &y]': [&&{unknown}; _]
104 38..39 'y': &{unknown}
105 41..43 '&y': &&{unknown}
106 42..43 'y': &{unknown}
107 "#]],
108 );
109}
110
111#[test]
112fn recursive_vars_2() {
113 check_infer(
114 r#"
115 fn test() {
116 let x = unknown;
117 let y = unknown;
118 [(x, y), (&y, &x)];
119 }
120 "#,
121 expect![[r#"
122 10..79 '{ ...x)]; }': ()
123 20..21 'x': &&{unknown}
124 24..31 'unknown': &&{unknown}
125 41..42 'y': &&{unknown}
126 45..52 'unknown': &&{unknown}
127 58..76 '[(x, y..., &x)]': [(&&&{unknown}, &&&{unknown}); _]
128 59..65 '(x, y)': (&&&{unknown}, &&&{unknown})
129 60..61 'x': &&{unknown}
130 63..64 'y': &&{unknown}
131 67..75 '(&y, &x)': (&&&{unknown}, &&&{unknown})
132 68..70 '&y': &&&{unknown}
133 69..70 'y': &&{unknown}
134 72..74 '&x': &&&{unknown}
135 73..74 'x': &&{unknown}
136 "#]],
137 );
138}
139
140#[test]
141fn infer_std_crash_1() {
142 // caused stack overflow, taken from std
143 check_infer(
144 r#"
145 enum Maybe<T> {
146 Real(T),
147 Fake,
148 }
149
150 fn write() {
151 match something_unknown {
152 Maybe::Real(ref mut something) => (),
153 }
154 }
155 "#,
156 expect![[r#"
157 53..138 '{ ... } }': ()
158 59..136 'match ... }': ()
159 65..82 'someth...nknown': Maybe<{unknown}>
160 93..123 'Maybe:...thing)': Maybe<{unknown}>
161 105..122 'ref mu...ething': &mut {unknown}
162 127..129 '()': ()
163 "#]],
164 );
165}
166
167#[test]
168fn infer_std_crash_2() {
169 mark::check!(type_var_resolves_to_int_var);
170 // caused "equating two type variables, ...", taken from std
171 check_infer(
172 r#"
173 fn test_line_buffer() {
174 &[0, b'\n', 1, b'\n'];
175 }
176 "#,
177 expect![[r#"
178 22..52 '{ ...n']; }': ()
179 28..49 '&[0, b...b'\n']': &[u8; _]
180 29..49 '[0, b'...b'\n']': [u8; _]
181 30..31 '0': u8
182 33..38 'b'\n'': u8
183 40..41 '1': u8
184 43..48 'b'\n'': u8
185 "#]],
186 );
187}
188
189#[test]
190fn infer_std_crash_3() {
191 // taken from rustc
192 check_infer(
193 r#"
194 pub fn compute() {
195 match nope!() {
196 SizeSkeleton::Pointer { non_zero: true, tail } => {}
197 }
198 }
199 "#,
200 expect![[r#"
201 17..107 '{ ... } }': ()
202 23..105 'match ... }': ()
203 29..36 'nope!()': {unknown}
204 47..93 'SizeSk...tail }': {unknown}
205 81..85 'true': bool
206 81..85 'true': bool
207 87..91 'tail': {unknown}
208 97..99 '{}': ()
209 "#]],
210 );
211}
212
213#[test]
214fn infer_std_crash_4() {
215 // taken from rustc
216 check_infer(
217 r#"
218 pub fn primitive_type() {
219 match *self {
220 BorrowedRef { type_: Primitive(p), ..} => {},
221 }
222 }
223 "#,
224 expect![[r#"
225 24..105 '{ ... } }': ()
226 30..103 'match ... }': ()
227 36..41 '*self': {unknown}
228 37..41 'self': {unknown}
229 52..90 'Borrow...), ..}': {unknown}
230 73..85 'Primitive(p)': {unknown}
231 83..84 'p': {unknown}
232 94..96 '{}': ()
233 "#]],
234 );
235}
236
237#[test]
238fn infer_std_crash_5() {
239 // taken from rustc
240 check_infer(
241 r#"
242 fn extra_compiler_flags() {
243 for content in doesnt_matter {
244 let name = if doesnt_matter {
245 first
246 } else {
247 &content
248 };
249
250 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
251 name
252 } else {
253 content
254 };
255 }
256 }
257 "#,
258 expect![[r#"
259 26..322 '{ ... } }': ()
260 32..320 'for co... }': ()
261 36..43 'content': &{unknown}
262 47..60 'doesnt_matter': {unknown}
263 61..320 '{ ... }': ()
264 75..79 'name': &&{unknown}
265 82..166 'if doe... }': &&{unknown}
266 85..98 'doesnt_matter': bool
267 99..128 '{ ... }': &&{unknown}
268 113..118 'first': &&{unknown}
269 134..166 '{ ... }': &&{unknown}
270 148..156 '&content': &&{unknown}
271 149..156 'content': &{unknown}
272 181..188 'content': &{unknown}
273 191..313 'if ICE... }': &{unknown}
274 194..231 'ICE_RE..._VALUE': {unknown}
275 194..247 'ICE_RE...&name)': bool
276 241..246 '&name': &&&{unknown}
277 242..246 'name': &&{unknown}
278 248..276 '{ ... }': &&{unknown}
279 262..266 'name': &&{unknown}
280 282..313 '{ ... }': &{unknown}
281 296..303 'content': &{unknown}
282 "#]],
283 );
284}
285
286#[test]
287fn infer_nested_generics_crash() {
288 // another crash found typechecking rustc
289 check_infer(
290 r#"
291 struct Canonical<V> {
292 value: V,
293 }
294 struct QueryResponse<V> {
295 value: V,
296 }
297 fn test<R>(query_response: Canonical<QueryResponse<R>>) {
298 &query_response.value;
299 }
300 "#,
301 expect![[r#"
302 91..105 'query_response': Canonical<QueryResponse<R>>
303 136..166 '{ ...lue; }': ()
304 142..163 '&query....value': &QueryResponse<R>
305 143..157 'query_response': Canonical<QueryResponse<R>>
306 143..163 'query_....value': QueryResponse<R>
307 "#]],
308 );
309}
310
311#[test]
312fn infer_paren_macro_call() {
313 check_infer(
314 r#"
315 macro_rules! bar { () => {0u32} }
316 fn test() {
317 let a = (bar!());
318 }
319 "#,
320 expect![[r#"
321 !0..4 '0u32': u32
322 44..69 '{ ...()); }': ()
323 54..55 'a': u32
324 "#]],
325 );
326}
327
328#[test]
329fn bug_1030() {
330 check_infer(
331 r#"
332 struct HashSet<T, H>;
333 struct FxHasher;
334 type FxHashSet<T> = HashSet<T, FxHasher>;
335
336 impl<T, H> HashSet<T, H> {
337 fn default() -> HashSet<T, H> {}
338 }
339
340 pub fn main_loop() {
341 FxHashSet::default();
342 }
343 "#,
344 expect![[r#"
345 143..145 '{}': ()
346 168..197 '{ ...t(); }': ()
347 174..192 'FxHash...efault': fn default<{unknown}, FxHasher>() -> HashSet<{unknown}, FxHasher>
348 174..194 'FxHash...ault()': HashSet<{unknown}, FxHasher>
349 "#]],
350 );
351}
352
353#[test]
354fn issue_2669() {
355 check_infer(
356 r#"
357 trait A {}
358 trait Write {}
359 struct Response<T> {}
360
361 trait D {
362 fn foo();
363 }
364
365 impl<T:A> D for Response<T> {
366 fn foo() {
367 end();
368 fn end<W: Write>() {
369 let _x: T = loop {};
370 }
371 }
372 }
373 "#,
374 expect![[r#"
375 119..214 '{ ... }': ()
376 129..132 'end': fn end<{unknown}>()
377 129..134 'end()': ()
378 163..208 '{ ... }': ()
379 181..183 '_x': !
380 190..197 'loop {}': !
381 195..197 '{}': ()
382 "#]],
383 )
384}
385
386#[test]
387fn issue_2705() {
388 check_infer(
389 r#"
390 trait Trait {}
391 fn test() {
392 <Trait<u32>>::foo()
393 }
394 "#,
395 expect![[r#"
396 25..52 '{ ...oo() }': ()
397 31..48 '<Trait...>::foo': {unknown}
398 31..50 '<Trait...:foo()': ()
399 "#]],
400 );
401}
402
403#[test]
404fn issue_2683_chars_impl() {
405 check_types(
406 r#"
407//- /main.rs crate:main deps:std
408fn test() {
409 let chars: std::str::Chars<'_>;
410 (chars.next(), chars.nth(1));
411} //^ (Option<char>, Option<char>)
412
413//- /std.rs crate:std
414#[prelude_import]
415use prelude::*;
416
417pub mod prelude {
418 pub use crate::iter::Iterator;
419 pub use crate::option::Option;
420}
421
422pub mod iter {
423 pub use self::traits::Iterator;
424 pub mod traits {
425 pub use self::iterator::Iterator;
426
427 pub mod iterator {
428 pub trait Iterator {
429 type Item;
430 fn next(&mut self) -> Option<Self::Item>;
431 fn nth(&mut self, n: usize) -> Option<Self::Item> {}
432 }
433 }
434 }
435}
436
437pub mod option {
438 pub enum Option<T> {}
439}
440
441pub mod str {
442 pub struct Chars<'a> {}
443 impl<'a> Iterator for Chars<'a> {
444 type Item = char;
445 fn next(&mut self) -> Option<char> {}
446 }
447}
448"#,
449 );
450}
451
452#[test]
453fn issue_3642_bad_macro_stackover() {
454 check_types(
455 r#"
456#[macro_export]
457macro_rules! match_ast {
458 (match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };
459
460 (match ($node:expr) {
461 $( ast::$ast:ident($it:ident) => $res:expr, )*
462 _ => $catch_all:expr $(,)?
463 }) => {{
464 $( if let Some($it) = ast::$ast::cast($node.clone()) { $res } else )*
465 { $catch_all }
466 }};
467}
468
469fn main() {
470 let anchor = match_ast! {
471 //^ ()
472 match parent {
473 as => {},
474 _ => return None
475 }
476 };
477}"#,
478 );
479}
480
481#[test]
482fn issue_3999_slice() {
483 check_infer(
484 r#"
485 fn foo(params: &[usize]) {
486 match params {
487 [ps @ .., _] => {}
488 }
489 }
490 "#,
491 expect![[r#"
492 7..13 'params': &[usize]
493 25..80 '{ ... } }': ()
494 31..78 'match ... }': ()
495 37..43 'params': &[usize]
496 54..66 '[ps @ .., _]': [usize]
497 55..62 'ps @ ..': &[usize]
498 60..62 '..': [usize]
499 64..65 '_': usize
500 70..72 '{}': ()
501 "#]],
502 );
503}
504
505#[test]
506fn issue_3999_struct() {
507 // rust-analyzer should not panic on seeing this malformed
508 // record pattern.
509 check_infer(
510 r#"
511 struct Bar {
512 a: bool,
513 }
514 fn foo(b: Bar) {
515 match b {
516 Bar { a: .. } => {},
517 }
518 }
519 "#,
520 expect![[r#"
521 35..36 'b': Bar
522 43..95 '{ ... } }': ()
523 49..93 'match ... }': ()
524 55..56 'b': Bar
525 67..80 'Bar { a: .. }': Bar
526 76..78 '..': bool
527 84..86 '{}': ()
528 "#]],
529 );
530}
531
532#[test]
533fn issue_4235_name_conflicts() {
534 check_infer(
535 r#"
536 struct FOO {}
537 static FOO:FOO = FOO {};
538
539 impl FOO {
540 fn foo(&self) {}
541 }
542
543 fn main() {
544 let a = &FOO;
545 a.foo();
546 }
547 "#,
548 expect![[r#"
549 31..37 'FOO {}': FOO
550 63..67 'self': &FOO
551 69..71 '{}': ()
552 85..119 '{ ...o(); }': ()
553 95..96 'a': &FOO
554 99..103 '&FOO': &FOO
555 100..103 'FOO': FOO
556 109..110 'a': &FOO
557 109..116 'a.foo()': ()
558 "#]],
559 );
560}
561
562#[test]
563fn issue_4465_dollar_crate_at_type() {
564 check_infer(
565 r#"
566 pub struct Foo {}
567 pub fn anything<T>() -> T {
568 loop {}
569 }
570 macro_rules! foo {
571 () => {{
572 let r: $crate::Foo = anything();
573 r
574 }};
575 }
576 fn main() {
577 let _a = foo!();
578 }
579 "#,
580 expect![[r#"
581 44..59 '{ loop {} }': T
582 50..57 'loop {}': !
583 55..57 '{}': ()
584 !0..31 '{letr:...g();r}': Foo
585 !4..5 'r': Foo
586 !18..26 'anything': fn anything<Foo>() -> Foo
587 !18..28 'anything()': Foo
588 !29..30 'r': Foo
589 163..187 '{ ...!(); }': ()
590 173..175 '_a': Foo
591 "#]],
592 );
593}
594
595#[test]
596fn issue_4053_diesel_where_clauses() {
597 check_infer(
598 r#"
599 trait BoxedDsl<DB> {
600 type Output;
601 fn internal_into_boxed(self) -> Self::Output;
602 }
603
604 struct SelectStatement<From, Select, Distinct, Where, Order, LimitOffset, GroupBy, Locking> {
605 order: Order,
606 }
607
608 trait QueryFragment<DB: Backend> {}
609
610 trait Into<T> { fn into(self) -> T; }
611
612 impl<F, S, D, W, O, LOf, DB> BoxedDsl<DB>
613 for SelectStatement<F, S, D, W, O, LOf, G>
614 where
615 O: Into<dyn QueryFragment<DB>>,
616 {
617 type Output = XXX;
618
619 fn internal_into_boxed(self) -> Self::Output {
620 self.order.into();
621 }
622 }
623 "#,
624 expect![[r#"
625 65..69 'self': Self
626 267..271 'self': Self
627 466..470 'self': SelectStatement<F, S, D, W, O, LOf, {unknown}, {unknown}>
628 488..522 '{ ... }': ()
629 498..502 'self': SelectStatement<F, S, D, W, O, LOf, {unknown}, {unknown}>
630 498..508 'self.order': O
631 498..515 'self.o...into()': dyn QueryFragment<DB>
632 "#]],
633 );
634}
635
636#[test]
637fn issue_4953() {
638 check_infer(
639 r#"
640 pub struct Foo(pub i64);
641 impl Foo {
642 fn test() -> Self { Self(0i64) }
643 }
644 "#,
645 expect![[r#"
646 58..72 '{ Self(0i64) }': Foo
647 60..64 'Self': Foo(i64) -> Foo
648 60..70 'Self(0i64)': Foo
649 65..69 '0i64': i64
650 "#]],
651 );
652 check_infer(
653 r#"
654 pub struct Foo<T>(pub T);
655 impl Foo<i64> {
656 fn test() -> Self { Self(0i64) }
657 }
658 "#,
659 expect![[r#"
660 64..78 '{ Self(0i64) }': Foo<i64>
661 66..70 'Self': Foo<i64>(i64) -> Foo<i64>
662 66..76 'Self(0i64)': Foo<i64>
663 71..75 '0i64': i64
664 "#]],
665 );
666}
667
668#[test]
669fn issue_4931() {
670 check_infer(
671 r#"
672 trait Div<T> {
673 type Output;
674 }
675
676 trait CheckedDiv: Div<()> {}
677
678 trait PrimInt: CheckedDiv<Output = ()> {
679 fn pow(self);
680 }
681
682 fn check<T: PrimInt>(i: T) {
683 i.pow();
684 }
685 "#,
686 expect![[r#"
687 117..121 'self': Self
688 148..149 'i': T
689 154..170 '{ ...w(); }': ()
690 160..161 'i': T
691 160..167 'i.pow()': ()
692 "#]],
693 );
694}
695
696#[test]
697fn issue_4885() {
698 check_infer(
699 r#"
700 #[lang = "coerce_unsized"]
701 pub trait CoerceUnsized<T> {}
702
703 trait Future {
704 type Output;
705 }
706 trait Foo<R> {
707 type Bar;
708 }
709 fn foo<R, K>(key: &K) -> impl Future<Output = K::Bar>
710 where
711 K: Foo<R>,
712 {
713 bar(key)
714 }
715 fn bar<R, K>(key: &K) -> impl Future<Output = K::Bar>
716 where
717 K: Foo<R>,
718 {
719 }
720 "#,
721 expect![[r#"
722 136..139 'key': &K
723 198..214 '{ ...key) }': impl Future<Output = <K as Foo<R>>::Bar>
724 204..207 'bar': fn bar<R, K>(&K) -> impl Future<Output = <K as Foo<R>>::Bar>
725 204..212 'bar(key)': impl Future<Output = <K as Foo<R>>::Bar>
726 208..211 'key': &K
727 228..231 'key': &K
728 290..293 '{ }': ()
729 "#]],
730 );
731}
732
733#[test]
734fn issue_4800() {
735 check_infer(
736 r#"
737 trait Debug {}
738
739 struct Foo<T>;
740
741 type E1<T> = (T, T, T);
742 type E2<T> = E1<E1<E1<(T, T, T)>>>;
743
744 impl Debug for Foo<E2<()>> {}
745
746 struct Request;
747
748 pub trait Future {
749 type Output;
750 }
751
752 pub struct PeerSet<D>;
753
754 impl<D> Service<Request> for PeerSet<D>
755 where
756 D: Discover,
757 D::Key: Debug,
758 {
759 type Error = ();
760 type Future = dyn Future<Output = Self::Error>;
761
762 fn call(&mut self) -> Self::Future {
763 loop {}
764 }
765 }
766
767 pub trait Discover {
768 type Key;
769 }
770
771 pub trait Service<Request> {
772 type Error;
773 type Future: Future<Output = Self::Error>;
774 fn call(&mut self) -> Self::Future;
775 }
776 "#,
777 expect![[r#"
778 379..383 'self': &mut PeerSet<D>
779 401..424 '{ ... }': dyn Future<Output = ()>
780 411..418 'loop {}': !
781 416..418 '{}': ()
782 575..579 'self': &mut Self
783 "#]],
784 );
785}
786
787#[test]
788fn issue_4966() {
789 check_infer(
790 r#"
791 pub trait IntoIterator {
792 type Item;
793 }
794
795 struct Repeat<A> { element: A }
796
797 struct Map<F> { f: F }
798
799 struct Vec<T> {}
800
801 #[lang = "deref"]
802 pub trait Deref {
803 type Target;
804 }
805
806 impl<T> Deref for Vec<T> {
807 type Target = [T];
808 }
809
810 fn from_iter<A, T: IntoIterator<Item = A>>(iter: T) -> Vec<A> {}
811
812 fn main() {
813 let inner = Map { f: |_: &f64| 0.0 };
814
815 let repeat = Repeat { element: inner };
816
817 let vec = from_iter(repeat);
818
819 vec.foo_bar();
820 }
821 "#,
822 expect![[r#"
823 270..274 'iter': T
824 289..291 '{}': ()
825 303..447 '{ ...r(); }': ()
826 313..318 'inner': Map<|&f64| -> f64>
827 321..345 'Map { ... 0.0 }': Map<|&f64| -> f64>
828 330..343 '|_: &f64| 0.0': |&f64| -> f64
829 331..332 '_': &f64
830 340..343 '0.0': f64
831 356..362 'repeat': Repeat<Map<|&f64| -> f64>>
832 365..390 'Repeat...nner }': Repeat<Map<|&f64| -> f64>>
833 383..388 'inner': Map<|&f64| -> f64>
834 401..404 'vec': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
835 407..416 'from_iter': fn from_iter<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>, Repeat<Map<|&f64| -> f64>>>(Repeat<Map<|&f64| -> f64>>) -> Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
836 407..424 'from_i...epeat)': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
837 417..423 'repeat': Repeat<Map<|&f64| -> f64>>
838 431..434 'vec': Vec<IntoIterator::Item<Repeat<Map<|&f64| -> f64>>>>
839 431..444 'vec.foo_bar()': {unknown}
840 "#]],
841 );
842}
diff --git a/crates/hir_ty/src/tests/simple.rs b/crates/hir_ty/src/tests/simple.rs
new file mode 100644
index 000000000..48db23a34
--- /dev/null
+++ b/crates/hir_ty/src/tests/simple.rs
@@ -0,0 +1,2218 @@
1use expect_test::expect;
2
3use super::{check_infer, check_types};
4
5#[test]
6fn infer_box() {
7 check_types(
8 r#"
9//- /main.rs crate:main deps:std
10fn test() {
11 let x = box 1;
12 let t = (x, box x, box &1, box [1]);
13 t;
14} //^ (Box<i32>, Box<Box<i32>>, Box<&i32>, Box<[i32; _]>)
15
16//- /std.rs crate:std
17#[prelude_import] use prelude::*;
18mod prelude {}
19
20mod boxed {
21 #[lang = "owned_box"]
22 pub struct Box<T: ?Sized> {
23 inner: *mut T,
24 }
25}
26"#,
27 );
28}
29
30#[test]
31fn infer_adt_self() {
32 check_types(
33 r#"
34enum Nat { Succ(Self), Demo(Nat), Zero }
35
36fn test() {
37 let foo: Nat = Nat::Zero;
38 if let Nat::Succ(x) = foo {
39 x
40 } //^ Nat
41}
42"#,
43 );
44}
45
46#[test]
47fn self_in_struct_lit() {
48 check_infer(
49 r#"
50 //- /main.rs
51 struct S<T> { x: T }
52
53 impl S<u32> {
54 fn foo() {
55 Self { x: 1 };
56 }
57 }
58 "#,
59 expect![[r#"
60 49..79 '{ ... }': ()
61 59..72 'Self { x: 1 }': S<u32>
62 69..70 '1': u32
63 "#]],
64 );
65}
66
67#[test]
68fn type_alias_in_struct_lit() {
69 check_infer(
70 r#"
71 //- /main.rs
72 struct S<T> { x: T }
73
74 type SS = S<u32>;
75
76 fn foo() {
77 SS { x: 1 };
78 }
79 "#,
80 expect![[r#"
81 50..70 '{ ...1 }; }': ()
82 56..67 'SS { x: 1 }': S<u32>
83 64..65 '1': u32
84 "#]],
85 );
86}
87
88#[test]
89fn infer_ranges() {
90 check_types(
91 r#"
92//- /main.rs crate:main deps:core
93fn test() {
94 let a = ..;
95 let b = 1..;
96 let c = ..2u32;
97 let d = 1..2usize;
98 let e = ..=10;
99 let f = 'a'..='z';
100
101 let t = (a, b, c, d, e, f);
102 t;
103} //^ (RangeFull, RangeFrom<i32>, RangeTo<u32>, Range<usize>, RangeToInclusive<i32>, RangeInclusive<char>)
104
105//- /core.rs crate:core
106#[prelude_import] use prelude::*;
107mod prelude {}
108
109pub mod ops {
110 pub struct Range<Idx> {
111 pub start: Idx,
112 pub end: Idx,
113 }
114 pub struct RangeFrom<Idx> {
115 pub start: Idx,
116 }
117 struct RangeFull;
118 pub struct RangeInclusive<Idx> {
119 start: Idx,
120 end: Idx,
121 is_empty: u8,
122 }
123 pub struct RangeTo<Idx> {
124 pub end: Idx,
125 }
126 pub struct RangeToInclusive<Idx> {
127 pub end: Idx,
128 }
129}
130"#,
131 );
132}
133
134#[test]
135fn infer_while_let() {
136 check_types(
137 r#"
138enum Option<T> { Some(T), None }
139
140fn test() {
141 let foo: Option<f32> = None;
142 while let Option::Some(x) = foo {
143 x
144 } //^ f32
145}
146"#,
147 );
148}
149
150#[test]
151fn infer_basics() {
152 check_infer(
153 r#"
154 fn test(a: u32, b: isize, c: !, d: &str) {
155 a;
156 b;
157 c;
158 d;
159 1usize;
160 1isize;
161 "test";
162 1.0f32;
163 }"#,
164 expect![[r#"
165 8..9 'a': u32
166 16..17 'b': isize
167 26..27 'c': !
168 32..33 'd': &str
169 41..120 '{ ...f32; }': ()
170 47..48 'a': u32
171 54..55 'b': isize
172 61..62 'c': !
173 68..69 'd': &str
174 75..81 '1usize': usize
175 87..93 '1isize': isize
176 99..105 '"test"': &str
177 111..117 '1.0f32': f32
178 "#]],
179 );
180}
181
182#[test]
183fn infer_let() {
184 check_infer(
185 r#"
186 fn test() {
187 let a = 1isize;
188 let b: usize = 1;
189 let c = b;
190 let d: u32;
191 let e;
192 let f: i32 = e;
193 }
194 "#,
195 expect![[r#"
196 10..117 '{ ...= e; }': ()
197 20..21 'a': isize
198 24..30 '1isize': isize
199 40..41 'b': usize
200 51..52 '1': usize
201 62..63 'c': usize
202 66..67 'b': usize
203 77..78 'd': u32
204 93..94 'e': i32
205 104..105 'f': i32
206 113..114 'e': i32
207 "#]],
208 );
209}
210
211#[test]
212fn infer_paths() {
213 check_infer(
214 r#"
215 fn a() -> u32 { 1 }
216
217 mod b {
218 fn c() -> u32 { 1 }
219 }
220
221 fn test() {
222 a();
223 b::c();
224 }
225 "#,
226 expect![[r#"
227 14..19 '{ 1 }': u32
228 16..17 '1': u32
229 47..52 '{ 1 }': u32
230 49..50 '1': u32
231 66..90 '{ ...c(); }': ()
232 72..73 'a': fn a() -> u32
233 72..75 'a()': u32
234 81..85 'b::c': fn c() -> u32
235 81..87 'b::c()': u32
236 "#]],
237 );
238}
239
240#[test]
241fn infer_path_type() {
242 check_infer(
243 r#"
244 struct S;
245
246 impl S {
247 fn foo() -> i32 { 1 }
248 }
249
250 fn test() {
251 S::foo();
252 <S>::foo();
253 }
254 "#,
255 expect![[r#"
256 40..45 '{ 1 }': i32
257 42..43 '1': i32
258 59..92 '{ ...o(); }': ()
259 65..71 'S::foo': fn foo() -> i32
260 65..73 'S::foo()': i32
261 79..87 '<S>::foo': fn foo() -> i32
262 79..89 '<S>::foo()': i32
263 "#]],
264 );
265}
266
267#[test]
268fn infer_struct() {
269 check_infer(
270 r#"
271 struct A {
272 b: B,
273 c: C,
274 }
275 struct B;
276 struct C(usize);
277
278 fn test() {
279 let c = C(1);
280 B;
281 let a: A = A { b: B, c: C(1) };
282 a.b;
283 a.c;
284 }
285 "#,
286 expect![[r#"
287 71..153 '{ ...a.c; }': ()
288 81..82 'c': C
289 85..86 'C': C(usize) -> C
290 85..89 'C(1)': C
291 87..88 '1': usize
292 95..96 'B': B
293 106..107 'a': A
294 113..132 'A { b:...C(1) }': A
295 120..121 'B': B
296 126..127 'C': C(usize) -> C
297 126..130 'C(1)': C
298 128..129 '1': usize
299 138..139 'a': A
300 138..141 'a.b': B
301 147..148 'a': A
302 147..150 'a.c': C
303 "#]],
304 );
305}
306
307#[test]
308fn infer_enum() {
309 check_infer(
310 r#"
311 enum E {
312 V1 { field: u32 },
313 V2
314 }
315 fn test() {
316 E::V1 { field: 1 };
317 E::V2;
318 }"#,
319 expect![[r#"
320 51..89 '{ ...:V2; }': ()
321 57..75 'E::V1 ...d: 1 }': E
322 72..73 '1': u32
323 81..86 'E::V2': E
324 "#]],
325 );
326}
327
328#[test]
329fn infer_union() {
330 check_infer(
331 r#"
332 union MyUnion {
333 foo: u32,
334 bar: f32,
335 }
336
337 fn test() {
338 let u = MyUnion { foo: 0 };
339 unsafe { baz(u); }
340 let u = MyUnion { bar: 0.0 };
341 unsafe { baz(u); }
342 }
343
344 unsafe fn baz(u: MyUnion) {
345 let inner = u.foo;
346 let inner = u.bar;
347 }
348 "#,
349 expect![[r#"
350 57..172 '{ ...); } }': ()
351 67..68 'u': MyUnion
352 71..89 'MyUnio...o: 0 }': MyUnion
353 86..87 '0': u32
354 95..113 'unsafe...(u); }': ()
355 102..113 '{ baz(u); }': ()
356 104..107 'baz': fn baz(MyUnion)
357 104..110 'baz(u)': ()
358 108..109 'u': MyUnion
359 122..123 'u': MyUnion
360 126..146 'MyUnio... 0.0 }': MyUnion
361 141..144 '0.0': f32
362 152..170 'unsafe...(u); }': ()
363 159..170 '{ baz(u); }': ()
364 161..164 'baz': fn baz(MyUnion)
365 161..167 'baz(u)': ()
366 165..166 'u': MyUnion
367 188..189 'u': MyUnion
368 200..249 '{ ...bar; }': ()
369 210..215 'inner': u32
370 218..219 'u': MyUnion
371 218..223 'u.foo': u32
372 233..238 'inner': f32
373 241..242 'u': MyUnion
374 241..246 'u.bar': f32
375 "#]],
376 );
377}
378
379#[test]
380fn infer_refs() {
381 check_infer(
382 r#"
383 fn test(a: &u32, b: &mut u32, c: *const u32, d: *mut u32) {
384 a;
385 *a;
386 &a;
387 &mut a;
388 b;
389 *b;
390 &b;
391 c;
392 *c;
393 d;
394 *d;
395 }
396 "#,
397 expect![[r#"
398 8..9 'a': &u32
399 17..18 'b': &mut u32
400 30..31 'c': *const u32
401 45..46 'd': *mut u32
402 58..149 '{ ... *d; }': ()
403 64..65 'a': &u32
404 71..73 '*a': u32
405 72..73 'a': &u32
406 79..81 '&a': &&u32
407 80..81 'a': &u32
408 87..93 '&mut a': &mut &u32
409 92..93 'a': &u32
410 99..100 'b': &mut u32
411 106..108 '*b': u32
412 107..108 'b': &mut u32
413 114..116 '&b': &&mut u32
414 115..116 'b': &mut u32
415 122..123 'c': *const u32
416 129..131 '*c': u32
417 130..131 'c': *const u32
418 137..138 'd': *mut u32
419 144..146 '*d': u32
420 145..146 'd': *mut u32
421 "#]],
422 );
423}
424
425#[test]
426fn infer_raw_ref() {
427 check_infer(
428 r#"
429 fn test(a: i32) {
430 &raw mut a;
431 &raw const a;
432 }
433 "#,
434 expect![[r#"
435 8..9 'a': i32
436 16..53 '{ ...t a; }': ()
437 22..32 '&raw mut a': *mut i32
438 31..32 'a': i32
439 38..50 '&raw const a': *const i32
440 49..50 'a': i32
441 "#]],
442 );
443}
444
445#[test]
446fn infer_literals() {
447 check_infer(
448 r##"
449 fn test() {
450 5i32;
451 5f32;
452 5f64;
453 "hello";
454 b"bytes";
455 'c';
456 b'b';
457 3.14;
458 5000;
459 false;
460 true;
461 r#"
462 //! doc
463 // non-doc
464 mod foo {}
465 "#;
466 br#"yolo"#;
467 }
468 "##,
469 expect![[r##"
470 10..216 '{ ...o"#; }': ()
471 16..20 '5i32': i32
472 26..30 '5f32': f32
473 36..40 '5f64': f64
474 46..53 '"hello"': &str
475 59..67 'b"bytes"': &[u8; _]
476 73..76 ''c'': char
477 82..86 'b'b'': u8
478 92..96 '3.14': f64
479 102..106 '5000': i32
480 112..117 'false': bool
481 123..127 'true': bool
482 133..197 'r#" ... "#': &str
483 203..213 'br#"yolo"#': &[u8; _]
484 "##]],
485 );
486}
487
488#[test]
489fn infer_unary_op() {
490 check_infer(
491 r#"
492 enum SomeType {}
493
494 fn test(x: SomeType) {
495 let b = false;
496 let c = !b;
497 let a = 100;
498 let d: i128 = -a;
499 let e = -100;
500 let f = !!!true;
501 let g = !42;
502 let h = !10u32;
503 let j = !a;
504 -3.14;
505 !3;
506 -x;
507 !x;
508 -"hello";
509 !"hello";
510 }
511 "#,
512 expect![[r#"
513 26..27 'x': SomeType
514 39..271 '{ ...lo"; }': ()
515 49..50 'b': bool
516 53..58 'false': bool
517 68..69 'c': bool
518 72..74 '!b': bool
519 73..74 'b': bool
520 84..85 'a': i128
521 88..91 '100': i128
522 101..102 'd': i128
523 111..113 '-a': i128
524 112..113 'a': i128
525 123..124 'e': i32
526 127..131 '-100': i32
527 128..131 '100': i32
528 141..142 'f': bool
529 145..152 '!!!true': bool
530 146..152 '!!true': bool
531 147..152 '!true': bool
532 148..152 'true': bool
533 162..163 'g': i32
534 166..169 '!42': i32
535 167..169 '42': i32
536 179..180 'h': u32
537 183..189 '!10u32': u32
538 184..189 '10u32': u32
539 199..200 'j': i128
540 203..205 '!a': i128
541 204..205 'a': i128
542 211..216 '-3.14': f64
543 212..216 '3.14': f64
544 222..224 '!3': i32
545 223..224 '3': i32
546 230..232 '-x': {unknown}
547 231..232 'x': SomeType
548 238..240 '!x': {unknown}
549 239..240 'x': SomeType
550 246..254 '-"hello"': {unknown}
551 247..254 '"hello"': &str
552 260..268 '!"hello"': {unknown}
553 261..268 '"hello"': &str
554 "#]],
555 );
556}
557
558#[test]
559fn infer_backwards() {
560 check_infer(
561 r#"
562 fn takes_u32(x: u32) {}
563
564 struct S { i32_field: i32 }
565
566 fn test() -> &mut &f64 {
567 let a = unknown_function();
568 takes_u32(a);
569 let b = unknown_function();
570 S { i32_field: b };
571 let c = unknown_function();
572 &mut &c
573 }
574 "#,
575 expect![[r#"
576 13..14 'x': u32
577 21..23 '{}': ()
578 77..230 '{ ...t &c }': &mut &f64
579 87..88 'a': u32
580 91..107 'unknow...nction': {unknown}
581 91..109 'unknow...tion()': u32
582 115..124 'takes_u32': fn takes_u32(u32)
583 115..127 'takes_u32(a)': ()
584 125..126 'a': u32
585 137..138 'b': i32
586 141..157 'unknow...nction': {unknown}
587 141..159 'unknow...tion()': i32
588 165..183 'S { i3...d: b }': S
589 180..181 'b': i32
590 193..194 'c': f64
591 197..213 'unknow...nction': {unknown}
592 197..215 'unknow...tion()': f64
593 221..228 '&mut &c': &mut &f64
594 226..228 '&c': &f64
595 227..228 'c': f64
596 "#]],
597 );
598}
599
600#[test]
601fn infer_self() {
602 check_infer(
603 r#"
604 struct S;
605
606 impl S {
607 fn test(&self) {
608 self;
609 }
610 fn test2(self: &Self) {
611 self;
612 }
613 fn test3() -> Self {
614 S {}
615 }
616 fn test4() -> Self {
617 Self {}
618 }
619 }
620 "#,
621 expect![[r#"
622 33..37 'self': &S
623 39..60 '{ ... }': ()
624 49..53 'self': &S
625 74..78 'self': &S
626 87..108 '{ ... }': ()
627 97..101 'self': &S
628 132..152 '{ ... }': S
629 142..146 'S {}': S
630 176..199 '{ ... }': S
631 186..193 'Self {}': S
632 "#]],
633 );
634}
635
636#[test]
637fn infer_self_as_path() {
638 check_infer(
639 r#"
640 struct S1;
641 struct S2(isize);
642 enum E {
643 V1,
644 V2(u32),
645 }
646
647 impl S1 {
648 fn test() {
649 Self;
650 }
651 }
652 impl S2 {
653 fn test() {
654 Self(1);
655 }
656 }
657 impl E {
658 fn test() {
659 Self::V1;
660 Self::V2(1);
661 }
662 }
663 "#,
664 expect![[r#"
665 86..107 '{ ... }': ()
666 96..100 'Self': S1
667 134..158 '{ ... }': ()
668 144..148 'Self': S2(isize) -> S2
669 144..151 'Self(1)': S2
670 149..150 '1': isize
671 184..230 '{ ... }': ()
672 194..202 'Self::V1': E
673 212..220 'Self::V2': V2(u32) -> E
674 212..223 'Self::V2(1)': E
675 221..222 '1': u32
676 "#]],
677 );
678}
679
680#[test]
681fn infer_binary_op() {
682 check_infer(
683 r#"
684 fn f(x: bool) -> i32 {
685 0i32
686 }
687
688 fn test() -> bool {
689 let x = a && b;
690 let y = true || false;
691 let z = x == y;
692 let t = x != y;
693 let minus_forty: isize = -40isize;
694 let h = minus_forty <= CONST_2;
695 let c = f(z || y) + 5;
696 let d = b;
697 let g = minus_forty ^= i;
698 let ten: usize = 10;
699 let ten_is_eleven = ten == some_num;
700
701 ten < 3
702 }
703 "#,
704 expect![[r#"
705 5..6 'x': bool
706 21..33 '{ 0i32 }': i32
707 27..31 '0i32': i32
708 53..369 '{ ... < 3 }': bool
709 63..64 'x': bool
710 67..68 'a': bool
711 67..73 'a && b': bool
712 72..73 'b': bool
713 83..84 'y': bool
714 87..91 'true': bool
715 87..100 'true || false': bool
716 95..100 'false': bool
717 110..111 'z': bool
718 114..115 'x': bool
719 114..120 'x == y': bool
720 119..120 'y': bool
721 130..131 't': bool
722 134..135 'x': bool
723 134..140 'x != y': bool
724 139..140 'y': bool
725 150..161 'minus_forty': isize
726 171..179 '-40isize': isize
727 172..179 '40isize': isize
728 189..190 'h': bool
729 193..204 'minus_forty': isize
730 193..215 'minus_...ONST_2': bool
731 208..215 'CONST_2': isize
732 225..226 'c': i32
733 229..230 'f': fn f(bool) -> i32
734 229..238 'f(z || y)': i32
735 229..242 'f(z || y) + 5': i32
736 231..232 'z': bool
737 231..237 'z || y': bool
738 236..237 'y': bool
739 241..242 '5': i32
740 252..253 'd': {unknown}
741 256..257 'b': {unknown}
742 267..268 'g': ()
743 271..282 'minus_forty': isize
744 271..287 'minus_...y ^= i': ()
745 286..287 'i': isize
746 297..300 'ten': usize
747 310..312 '10': usize
748 322..335 'ten_is_eleven': bool
749 338..341 'ten': usize
750 338..353 'ten == some_num': bool
751 345..353 'some_num': usize
752 360..363 'ten': usize
753 360..367 'ten < 3': bool
754 366..367 '3': usize
755 "#]],
756 );
757}
758
759#[test]
760fn infer_shift_op() {
761 check_infer(
762 r#"
763 fn test() {
764 1u32 << 5u8;
765 1u32 >> 5u8;
766 }
767 "#,
768 expect![[r#"
769 10..47 '{ ...5u8; }': ()
770 16..20 '1u32': u32
771 16..27 '1u32 << 5u8': u32
772 24..27 '5u8': u8
773 33..37 '1u32': u32
774 33..44 '1u32 >> 5u8': u32
775 41..44 '5u8': u8
776 "#]],
777 );
778}
779
780#[test]
781fn infer_field_autoderef() {
782 check_infer(
783 r#"
784 struct A {
785 b: B,
786 }
787 struct B;
788
789 fn test1(a: A) {
790 let a1 = a;
791 a1.b;
792 let a2 = &a;
793 a2.b;
794 let a3 = &mut a;
795 a3.b;
796 let a4 = &&&&&&&a;
797 a4.b;
798 let a5 = &mut &&mut &&mut a;
799 a5.b;
800 }
801
802 fn test2(a1: *const A, a2: *mut A) {
803 a1.b;
804 a2.b;
805 }
806 "#,
807 expect![[r#"
808 43..44 'a': A
809 49..212 '{ ...5.b; }': ()
810 59..61 'a1': A
811 64..65 'a': A
812 71..73 'a1': A
813 71..75 'a1.b': B
814 85..87 'a2': &A
815 90..92 '&a': &A
816 91..92 'a': A
817 98..100 'a2': &A
818 98..102 'a2.b': B
819 112..114 'a3': &mut A
820 117..123 '&mut a': &mut A
821 122..123 'a': A
822 129..131 'a3': &mut A
823 129..133 'a3.b': B
824 143..145 'a4': &&&&&&&A
825 148..156 '&&&&&&&a': &&&&&&&A
826 149..156 '&&&&&&a': &&&&&&A
827 150..156 '&&&&&a': &&&&&A
828 151..156 '&&&&a': &&&&A
829 152..156 '&&&a': &&&A
830 153..156 '&&a': &&A
831 154..156 '&a': &A
832 155..156 'a': A
833 162..164 'a4': &&&&&&&A
834 162..166 'a4.b': B
835 176..178 'a5': &mut &&mut &&mut A
836 181..199 '&mut &...&mut a': &mut &&mut &&mut A
837 186..199 '&&mut &&mut a': &&mut &&mut A
838 187..199 '&mut &&mut a': &mut &&mut A
839 192..199 '&&mut a': &&mut A
840 193..199 '&mut a': &mut A
841 198..199 'a': A
842 205..207 'a5': &mut &&mut &&mut A
843 205..209 'a5.b': B
844 223..225 'a1': *const A
845 237..239 'a2': *mut A
846 249..272 '{ ...2.b; }': ()
847 255..257 'a1': *const A
848 255..259 'a1.b': B
849 265..267 'a2': *mut A
850 265..269 'a2.b': B
851 "#]],
852 );
853}
854
855#[test]
856fn infer_argument_autoderef() {
857 check_infer(
858 r#"
859 #[lang = "deref"]
860 pub trait Deref {
861 type Target;
862 fn deref(&self) -> &Self::Target;
863 }
864
865 struct A<T>(T);
866
867 impl<T> A<T> {
868 fn foo(&self) -> &T {
869 &self.0
870 }
871 }
872
873 struct B<T>(T);
874
875 impl<T> Deref for B<T> {
876 type Target = T;
877 fn deref(&self) -> &Self::Target {
878 &self.0
879 }
880 }
881
882 fn test() {
883 let t = A::foo(&&B(B(A(42))));
884 }
885 "#,
886 expect![[r#"
887 67..71 'self': &Self
888 138..142 'self': &A<T>
889 150..173 '{ ... }': &T
890 160..167 '&self.0': &T
891 161..165 'self': &A<T>
892 161..167 'self.0': T
893 254..258 'self': &B<T>
894 277..300 '{ ... }': &T
895 287..294 '&self.0': &T
896 288..292 'self': &B<T>
897 288..294 'self.0': T
898 314..352 '{ ...))); }': ()
899 324..325 't': &i32
900 328..334 'A::foo': fn foo<i32>(&A<i32>) -> &i32
901 328..349 'A::foo...42))))': &i32
902 335..348 '&&B(B(A(42)))': &&B<B<A<i32>>>
903 336..348 '&B(B(A(42)))': &B<B<A<i32>>>
904 337..338 'B': B<B<A<i32>>>(B<A<i32>>) -> B<B<A<i32>>>
905 337..348 'B(B(A(42)))': B<B<A<i32>>>
906 339..340 'B': B<A<i32>>(A<i32>) -> B<A<i32>>
907 339..347 'B(A(42))': B<A<i32>>
908 341..342 'A': A<i32>(i32) -> A<i32>
909 341..346 'A(42)': A<i32>
910 343..345 '42': i32
911 "#]],
912 );
913}
914
915#[test]
916fn infer_method_argument_autoderef() {
917 check_infer(
918 r#"
919 #[lang = "deref"]
920 pub trait Deref {
921 type Target;
922 fn deref(&self) -> &Self::Target;
923 }
924
925 struct A<T>(*mut T);
926
927 impl<T> A<T> {
928 fn foo(&self, x: &A<T>) -> &T {
929 &*x.0
930 }
931 }
932
933 struct B<T>(T);
934
935 impl<T> Deref for B<T> {
936 type Target = T;
937 fn deref(&self) -> &Self::Target {
938 &self.0
939 }
940 }
941
942 fn test(a: A<i32>) {
943 let t = A(0 as *mut _).foo(&&B(B(a)));
944 }
945 "#,
946 expect![[r#"
947 67..71 'self': &Self
948 143..147 'self': &A<T>
949 149..150 'x': &A<T>
950 165..186 '{ ... }': &T
951 175..180 '&*x.0': &T
952 176..180 '*x.0': T
953 177..178 'x': &A<T>
954 177..180 'x.0': *mut T
955 267..271 'self': &B<T>
956 290..313 '{ ... }': &T
957 300..307 '&self.0': &T
958 301..305 'self': &B<T>
959 301..307 'self.0': T
960 325..326 'a': A<i32>
961 336..382 '{ ...))); }': ()
962 346..347 't': &i32
963 350..351 'A': A<i32>(*mut i32) -> A<i32>
964 350..364 'A(0 as *mut _)': A<i32>
965 350..379 'A(0 as...B(a)))': &i32
966 352..353 '0': i32
967 352..363 '0 as *mut _': *mut i32
968 369..378 '&&B(B(a))': &&B<B<A<i32>>>
969 370..378 '&B(B(a))': &B<B<A<i32>>>
970 371..372 'B': B<B<A<i32>>>(B<A<i32>>) -> B<B<A<i32>>>
971 371..378 'B(B(a))': B<B<A<i32>>>
972 373..374 'B': B<A<i32>>(A<i32>) -> B<A<i32>>
973 373..377 'B(a)': B<A<i32>>
974 375..376 'a': A<i32>
975 "#]],
976 );
977}
978
979#[test]
980fn infer_in_elseif() {
981 check_infer(
982 r#"
983 struct Foo { field: i32 }
984 fn main(foo: Foo) {
985 if true {
986
987 } else if false {
988 foo.field
989 }
990 }
991 "#,
992 expect![[r#"
993 34..37 'foo': Foo
994 44..108 '{ ... } }': ()
995 50..106 'if tru... }': ()
996 53..57 'true': bool
997 58..66 '{ }': ()
998 72..106 'if fal... }': i32
999 75..80 'false': bool
1000 81..106 '{ ... }': i32
1001 91..94 'foo': Foo
1002 91..100 'foo.field': i32
1003 "#]],
1004 )
1005}
1006
1007#[test]
1008fn infer_if_match_with_return() {
1009 check_infer(
1010 r#"
1011 fn foo() {
1012 let _x1 = if true {
1013 1
1014 } else {
1015 return;
1016 };
1017 let _x2 = if true {
1018 2
1019 } else {
1020 return
1021 };
1022 let _x3 = match true {
1023 true => 3,
1024 _ => {
1025 return;
1026 }
1027 };
1028 let _x4 = match true {
1029 true => 4,
1030 _ => return
1031 };
1032 }"#,
1033 expect![[r#"
1034 9..322 '{ ... }; }': ()
1035 19..22 '_x1': i32
1036 25..79 'if tru... }': i32
1037 28..32 'true': bool
1038 33..50 '{ ... }': i32
1039 43..44 '1': i32
1040 56..79 '{ ... }': i32
1041 66..72 'return': !
1042 89..92 '_x2': i32
1043 95..148 'if tru... }': i32
1044 98..102 'true': bool
1045 103..120 '{ ... }': i32
1046 113..114 '2': i32
1047 126..148 '{ ... }': !
1048 136..142 'return': !
1049 158..161 '_x3': i32
1050 164..246 'match ... }': i32
1051 170..174 'true': bool
1052 185..189 'true': bool
1053 185..189 'true': bool
1054 193..194 '3': i32
1055 204..205 '_': bool
1056 209..240 '{ ... }': i32
1057 223..229 'return': !
1058 256..259 '_x4': i32
1059 262..319 'match ... }': i32
1060 268..272 'true': bool
1061 283..287 'true': bool
1062 283..287 'true': bool
1063 291..292 '4': i32
1064 302..303 '_': bool
1065 307..313 'return': !
1066 "#]],
1067 )
1068}
1069
1070#[test]
1071fn infer_inherent_method() {
1072 check_infer(
1073 r#"
1074 struct A;
1075
1076 impl A {
1077 fn foo(self, x: u32) -> i32 {}
1078 }
1079
1080 mod b {
1081 impl super::A {
1082 fn bar(&self, x: u64) -> i64 {}
1083 }
1084 }
1085
1086 fn test(a: A) {
1087 a.foo(1);
1088 (&a).bar(1);
1089 a.bar(1);
1090 }
1091 "#,
1092 expect![[r#"
1093 31..35 'self': A
1094 37..38 'x': u32
1095 52..54 '{}': ()
1096 102..106 'self': &A
1097 108..109 'x': u64
1098 123..125 '{}': ()
1099 143..144 'a': A
1100 149..197 '{ ...(1); }': ()
1101 155..156 'a': A
1102 155..163 'a.foo(1)': i32
1103 161..162 '1': u32
1104 169..180 '(&a).bar(1)': i64
1105 170..172 '&a': &A
1106 171..172 'a': A
1107 178..179 '1': u64
1108 186..187 'a': A
1109 186..194 'a.bar(1)': i64
1110 192..193 '1': u64
1111 "#]],
1112 );
1113}
1114
1115#[test]
1116fn infer_inherent_method_str() {
1117 check_infer(
1118 r#"
1119 #[lang = "str"]
1120 impl str {
1121 fn foo(&self) -> i32 {}
1122 }
1123
1124 fn test() {
1125 "foo".foo();
1126 }
1127 "#,
1128 expect![[r#"
1129 39..43 'self': &str
1130 52..54 '{}': ()
1131 68..88 '{ ...o(); }': ()
1132 74..79 '"foo"': &str
1133 74..85 '"foo".foo()': i32
1134 "#]],
1135 );
1136}
1137
1138#[test]
1139fn infer_tuple() {
1140 check_infer(
1141 r#"
1142 fn test(x: &str, y: isize) {
1143 let a: (u32, &str) = (1, "a");
1144 let b = (a, x);
1145 let c = (y, x);
1146 let d = (c, x);
1147 let e = (1, "e");
1148 let f = (e, "d");
1149 }
1150 "#,
1151 expect![[r#"
1152 8..9 'x': &str
1153 17..18 'y': isize
1154 27..169 '{ ...d"); }': ()
1155 37..38 'a': (u32, &str)
1156 54..62 '(1, "a")': (u32, &str)
1157 55..56 '1': u32
1158 58..61 '"a"': &str
1159 72..73 'b': ((u32, &str), &str)
1160 76..82 '(a, x)': ((u32, &str), &str)
1161 77..78 'a': (u32, &str)
1162 80..81 'x': &str
1163 92..93 'c': (isize, &str)
1164 96..102 '(y, x)': (isize, &str)
1165 97..98 'y': isize
1166 100..101 'x': &str
1167 112..113 'd': ((isize, &str), &str)
1168 116..122 '(c, x)': ((isize, &str), &str)
1169 117..118 'c': (isize, &str)
1170 120..121 'x': &str
1171 132..133 'e': (i32, &str)
1172 136..144 '(1, "e")': (i32, &str)
1173 137..138 '1': i32
1174 140..143 '"e"': &str
1175 154..155 'f': ((i32, &str), &str)
1176 158..166 '(e, "d")': ((i32, &str), &str)
1177 159..160 'e': (i32, &str)
1178 162..165 '"d"': &str
1179 "#]],
1180 );
1181}
1182
1183#[test]
1184fn infer_array() {
1185 check_infer(
1186 r#"
1187 fn test(x: &str, y: isize) {
1188 let a = [x];
1189 let b = [a, a];
1190 let c = [b, b];
1191
1192 let d = [y, 1, 2, 3];
1193 let d = [1, y, 2, 3];
1194 let e = [y];
1195 let f = [d, d];
1196 let g = [e, e];
1197
1198 let h = [1, 2];
1199 let i = ["a", "b"];
1200
1201 let b = [a, ["b"]];
1202 let x: [u8; 0] = [];
1203 }
1204 "#,
1205 expect![[r#"
1206 8..9 'x': &str
1207 17..18 'y': isize
1208 27..292 '{ ... []; }': ()
1209 37..38 'a': [&str; _]
1210 41..44 '[x]': [&str; _]
1211 42..43 'x': &str
1212 54..55 'b': [[&str; _]; _]
1213 58..64 '[a, a]': [[&str; _]; _]
1214 59..60 'a': [&str; _]
1215 62..63 'a': [&str; _]
1216 74..75 'c': [[[&str; _]; _]; _]
1217 78..84 '[b, b]': [[[&str; _]; _]; _]
1218 79..80 'b': [[&str; _]; _]
1219 82..83 'b': [[&str; _]; _]
1220 95..96 'd': [isize; _]
1221 99..111 '[y, 1, 2, 3]': [isize; _]
1222 100..101 'y': isize
1223 103..104 '1': isize
1224 106..107 '2': isize
1225 109..110 '3': isize
1226 121..122 'd': [isize; _]
1227 125..137 '[1, y, 2, 3]': [isize; _]
1228 126..127 '1': isize
1229 129..130 'y': isize
1230 132..133 '2': isize
1231 135..136 '3': isize
1232 147..148 'e': [isize; _]
1233 151..154 '[y]': [isize; _]
1234 152..153 'y': isize
1235 164..165 'f': [[isize; _]; _]
1236 168..174 '[d, d]': [[isize; _]; _]
1237 169..170 'd': [isize; _]
1238 172..173 'd': [isize; _]
1239 184..185 'g': [[isize; _]; _]
1240 188..194 '[e, e]': [[isize; _]; _]
1241 189..190 'e': [isize; _]
1242 192..193 'e': [isize; _]
1243 205..206 'h': [i32; _]
1244 209..215 '[1, 2]': [i32; _]
1245 210..211 '1': i32
1246 213..214 '2': i32
1247 225..226 'i': [&str; _]
1248 229..239 '["a", "b"]': [&str; _]
1249 230..233 '"a"': &str
1250 235..238 '"b"': &str
1251 250..251 'b': [[&str; _]; _]
1252 254..264 '[a, ["b"]]': [[&str; _]; _]
1253 255..256 'a': [&str; _]
1254 258..263 '["b"]': [&str; _]
1255 259..262 '"b"': &str
1256 274..275 'x': [u8; _]
1257 287..289 '[]': [u8; _]
1258 "#]],
1259 );
1260}
1261
1262#[test]
1263fn infer_struct_generics() {
1264 check_infer(
1265 r#"
1266 struct A<T> {
1267 x: T,
1268 }
1269
1270 fn test(a1: A<u32>, i: i32) {
1271 a1.x;
1272 let a2 = A { x: i };
1273 a2.x;
1274 let a3 = A::<i128> { x: 1 };
1275 a3.x;
1276 }
1277 "#,
1278 expect![[r#"
1279 35..37 'a1': A<u32>
1280 47..48 'i': i32
1281 55..146 '{ ...3.x; }': ()
1282 61..63 'a1': A<u32>
1283 61..65 'a1.x': u32
1284 75..77 'a2': A<i32>
1285 80..90 'A { x: i }': A<i32>
1286 87..88 'i': i32
1287 96..98 'a2': A<i32>
1288 96..100 'a2.x': i32
1289 110..112 'a3': A<i128>
1290 115..133 'A::<i1...x: 1 }': A<i128>
1291 130..131 '1': i128
1292 139..141 'a3': A<i128>
1293 139..143 'a3.x': i128
1294 "#]],
1295 );
1296}
1297
1298#[test]
1299fn infer_tuple_struct_generics() {
1300 check_infer(
1301 r#"
1302 struct A<T>(T);
1303 enum Option<T> { Some(T), None }
1304 use Option::*;
1305
1306 fn test() {
1307 A(42);
1308 A(42u128);
1309 Some("x");
1310 Option::Some("x");
1311 None;
1312 let x: Option<i64> = None;
1313 }
1314 "#,
1315 expect![[r#"
1316 75..183 '{ ...one; }': ()
1317 81..82 'A': A<i32>(i32) -> A<i32>
1318 81..86 'A(42)': A<i32>
1319 83..85 '42': i32
1320 92..93 'A': A<u128>(u128) -> A<u128>
1321 92..101 'A(42u128)': A<u128>
1322 94..100 '42u128': u128
1323 107..111 'Some': Some<&str>(&str) -> Option<&str>
1324 107..116 'Some("x")': Option<&str>
1325 112..115 '"x"': &str
1326 122..134 'Option::Some': Some<&str>(&str) -> Option<&str>
1327 122..139 'Option...e("x")': Option<&str>
1328 135..138 '"x"': &str
1329 145..149 'None': Option<{unknown}>
1330 159..160 'x': Option<i64>
1331 176..180 'None': Option<i64>
1332 "#]],
1333 );
1334}
1335
1336#[test]
1337fn infer_function_generics() {
1338 check_infer(
1339 r#"
1340 fn id<T>(t: T) -> T { t }
1341
1342 fn test() {
1343 id(1u32);
1344 id::<i128>(1);
1345 let x: u64 = id(1);
1346 }
1347 "#,
1348 expect![[r#"
1349 9..10 't': T
1350 20..25 '{ t }': T
1351 22..23 't': T
1352 37..97 '{ ...(1); }': ()
1353 43..45 'id': fn id<u32>(u32) -> u32
1354 43..51 'id(1u32)': u32
1355 46..50 '1u32': u32
1356 57..67 'id::<i128>': fn id<i128>(i128) -> i128
1357 57..70 'id::<i128>(1)': i128
1358 68..69 '1': i128
1359 80..81 'x': u64
1360 89..91 'id': fn id<u64>(u64) -> u64
1361 89..94 'id(1)': u64
1362 92..93 '1': u64
1363 "#]],
1364 );
1365}
1366
1367#[test]
1368fn infer_impl_generics_basic() {
1369 check_infer(
1370 r#"
1371 struct A<T1, T2> {
1372 x: T1,
1373 y: T2,
1374 }
1375 impl<Y, X> A<X, Y> {
1376 fn x(self) -> X {
1377 self.x
1378 }
1379 fn y(self) -> Y {
1380 self.y
1381 }
1382 fn z<T>(self, t: T) -> (X, Y, T) {
1383 (self.x, self.y, t)
1384 }
1385 }
1386
1387 fn test() -> i128 {
1388 let a = A { x: 1u64, y: 1i64 };
1389 a.x();
1390 a.y();
1391 a.z(1i128);
1392 a.z::<u128>(1);
1393 }
1394 "#,
1395 expect![[r#"
1396 73..77 'self': A<X, Y>
1397 84..106 '{ ... }': X
1398 94..98 'self': A<X, Y>
1399 94..100 'self.x': X
1400 116..120 'self': A<X, Y>
1401 127..149 '{ ... }': Y
1402 137..141 'self': A<X, Y>
1403 137..143 'self.y': Y
1404 162..166 'self': A<X, Y>
1405 168..169 't': T
1406 187..222 '{ ... }': (X, Y, T)
1407 197..216 '(self.....y, t)': (X, Y, T)
1408 198..202 'self': A<X, Y>
1409 198..204 'self.x': X
1410 206..210 'self': A<X, Y>
1411 206..212 'self.y': Y
1412 214..215 't': T
1413 244..341 '{ ...(1); }': ()
1414 254..255 'a': A<u64, i64>
1415 258..280 'A { x:...1i64 }': A<u64, i64>
1416 265..269 '1u64': u64
1417 274..278 '1i64': i64
1418 286..287 'a': A<u64, i64>
1419 286..291 'a.x()': u64
1420 297..298 'a': A<u64, i64>
1421 297..302 'a.y()': i64
1422 308..309 'a': A<u64, i64>
1423 308..318 'a.z(1i128)': (u64, i64, i128)
1424 312..317 '1i128': i128
1425 324..325 'a': A<u64, i64>
1426 324..338 'a.z::<u128>(1)': (u64, i64, u128)
1427 336..337 '1': u128
1428 "#]],
1429 );
1430}
1431
1432#[test]
1433fn infer_impl_generics_with_autoderef() {
1434 check_infer(
1435 r#"
1436 enum Option<T> {
1437 Some(T),
1438 None,
1439 }
1440 impl<T> Option<T> {
1441 fn as_ref(&self) -> Option<&T> {}
1442 }
1443 fn test(o: Option<u32>) {
1444 (&o).as_ref();
1445 o.as_ref();
1446 }
1447 "#,
1448 expect![[r#"
1449 77..81 'self': &Option<T>
1450 97..99 '{}': ()
1451 110..111 'o': Option<u32>
1452 126..164 '{ ...f(); }': ()
1453 132..145 '(&o).as_ref()': Option<&u32>
1454 133..135 '&o': &Option<u32>
1455 134..135 'o': Option<u32>
1456 151..152 'o': Option<u32>
1457 151..161 'o.as_ref()': Option<&u32>
1458 "#]],
1459 );
1460}
1461
1462#[test]
1463fn infer_generic_chain() {
1464 check_infer(
1465 r#"
1466 struct A<T> {
1467 x: T,
1468 }
1469 impl<T2> A<T2> {
1470 fn x(self) -> T2 {
1471 self.x
1472 }
1473 }
1474 fn id<T>(t: T) -> T { t }
1475
1476 fn test() -> i128 {
1477 let x = 1;
1478 let y = id(x);
1479 let a = A { x: id(y) };
1480 let z = id(a.x);
1481 let b = A { x: z };
1482 b.x()
1483 }
1484 "#,
1485 expect![[r#"
1486 52..56 'self': A<T2>
1487 64..86 '{ ... }': T2
1488 74..78 'self': A<T2>
1489 74..80 'self.x': T2
1490 98..99 't': T
1491 109..114 '{ t }': T
1492 111..112 't': T
1493 134..254 '{ ....x() }': i128
1494 144..145 'x': i128
1495 148..149 '1': i128
1496 159..160 'y': i128
1497 163..165 'id': fn id<i128>(i128) -> i128
1498 163..168 'id(x)': i128
1499 166..167 'x': i128
1500 178..179 'a': A<i128>
1501 182..196 'A { x: id(y) }': A<i128>
1502 189..191 'id': fn id<i128>(i128) -> i128
1503 189..194 'id(y)': i128
1504 192..193 'y': i128
1505 206..207 'z': i128
1506 210..212 'id': fn id<i128>(i128) -> i128
1507 210..217 'id(a.x)': i128
1508 213..214 'a': A<i128>
1509 213..216 'a.x': i128
1510 227..228 'b': A<i128>
1511 231..241 'A { x: z }': A<i128>
1512 238..239 'z': i128
1513 247..248 'b': A<i128>
1514 247..252 'b.x()': i128
1515 "#]],
1516 );
1517}
1518
1519#[test]
1520fn infer_associated_const() {
1521 check_infer(
1522 r#"
1523 struct Struct;
1524
1525 impl Struct {
1526 const FOO: u32 = 1;
1527 }
1528
1529 enum Enum {}
1530
1531 impl Enum {
1532 const BAR: u32 = 2;
1533 }
1534
1535 trait Trait {
1536 const ID: u32;
1537 }
1538
1539 struct TraitTest;
1540
1541 impl Trait for TraitTest {
1542 const ID: u32 = 5;
1543 }
1544
1545 fn test() {
1546 let x = Struct::FOO;
1547 let y = Enum::BAR;
1548 let z = TraitTest::ID;
1549 }
1550 "#,
1551 expect![[r#"
1552 51..52 '1': u32
1553 104..105 '2': u32
1554 212..213 '5': u32
1555 228..306 '{ ...:ID; }': ()
1556 238..239 'x': u32
1557 242..253 'Struct::FOO': u32
1558 263..264 'y': u32
1559 267..276 'Enum::BAR': u32
1560 286..287 'z': u32
1561 290..303 'TraitTest::ID': u32
1562 "#]],
1563 );
1564}
1565
1566#[test]
1567fn infer_type_alias() {
1568 check_infer(
1569 r#"
1570 struct A<X, Y> { x: X, y: Y }
1571 type Foo = A<u32, i128>;
1572 type Bar<T> = A<T, u128>;
1573 type Baz<U, V> = A<V, U>;
1574 fn test(x: Foo, y: Bar<&str>, z: Baz<i8, u8>) {
1575 x.x;
1576 x.y;
1577 y.x;
1578 y.y;
1579 z.x;
1580 z.y;
1581 }
1582 "#,
1583 expect![[r#"
1584 115..116 'x': A<u32, i128>
1585 123..124 'y': A<&str, u128>
1586 137..138 'z': A<u8, i8>
1587 153..210 '{ ...z.y; }': ()
1588 159..160 'x': A<u32, i128>
1589 159..162 'x.x': u32
1590 168..169 'x': A<u32, i128>
1591 168..171 'x.y': i128
1592 177..178 'y': A<&str, u128>
1593 177..180 'y.x': &str
1594 186..187 'y': A<&str, u128>
1595 186..189 'y.y': u128
1596 195..196 'z': A<u8, i8>
1597 195..198 'z.x': u8
1598 204..205 'z': A<u8, i8>
1599 204..207 'z.y': i8
1600 "#]],
1601 )
1602}
1603
1604#[test]
1605fn recursive_type_alias() {
1606 check_infer(
1607 r#"
1608 struct A<X> {}
1609 type Foo = Foo;
1610 type Bar = A<Bar>;
1611 fn test(x: Foo) {}
1612 "#,
1613 expect![[r#"
1614 58..59 'x': {unknown}
1615 66..68 '{}': ()
1616 "#]],
1617 )
1618}
1619
1620#[test]
1621fn infer_type_param() {
1622 check_infer(
1623 r#"
1624 fn id<T>(x: T) -> T {
1625 x
1626 }
1627
1628 fn clone<T>(x: &T) -> T {
1629 *x
1630 }
1631
1632 fn test() {
1633 let y = 10u32;
1634 id(y);
1635 let x: bool = clone(z);
1636 id::<i128>(1);
1637 }
1638 "#,
1639 expect![[r#"
1640 9..10 'x': T
1641 20..29 '{ x }': T
1642 26..27 'x': T
1643 43..44 'x': &T
1644 55..65 '{ *x }': T
1645 61..63 '*x': T
1646 62..63 'x': &T
1647 77..157 '{ ...(1); }': ()
1648 87..88 'y': u32
1649 91..96 '10u32': u32
1650 102..104 'id': fn id<u32>(u32) -> u32
1651 102..107 'id(y)': u32
1652 105..106 'y': u32
1653 117..118 'x': bool
1654 127..132 'clone': fn clone<bool>(&bool) -> bool
1655 127..135 'clone(z)': bool
1656 133..134 'z': &bool
1657 141..151 'id::<i128>': fn id<i128>(i128) -> i128
1658 141..154 'id::<i128>(1)': i128
1659 152..153 '1': i128
1660 "#]],
1661 );
1662}
1663
1664#[test]
1665fn infer_const() {
1666 check_infer(
1667 r#"
1668 struct Foo;
1669 impl Foo { const ASSOC_CONST: u32 = 0; }
1670 const GLOBAL_CONST: u32 = 101;
1671 fn test() {
1672 const LOCAL_CONST: u32 = 99;
1673 let x = LOCAL_CONST;
1674 let z = GLOBAL_CONST;
1675 let id = Foo::ASSOC_CONST;
1676 }
1677 "#,
1678 expect![[r#"
1679 48..49 '0': u32
1680 79..82 '101': u32
1681 94..212 '{ ...NST; }': ()
1682 137..138 'x': u32
1683 141..152 'LOCAL_CONST': u32
1684 162..163 'z': u32
1685 166..178 'GLOBAL_CONST': u32
1686 188..190 'id': u32
1687 193..209 'Foo::A..._CONST': u32
1688 125..127 '99': u32
1689 "#]],
1690 );
1691}
1692
1693#[test]
1694fn infer_static() {
1695 check_infer(
1696 r#"
1697 static GLOBAL_STATIC: u32 = 101;
1698 static mut GLOBAL_STATIC_MUT: u32 = 101;
1699 fn test() {
1700 static LOCAL_STATIC: u32 = 99;
1701 static mut LOCAL_STATIC_MUT: u32 = 99;
1702 let x = LOCAL_STATIC;
1703 let y = LOCAL_STATIC_MUT;
1704 let z = GLOBAL_STATIC;
1705 let w = GLOBAL_STATIC_MUT;
1706 }
1707 "#,
1708 expect![[r#"
1709 28..31 '101': u32
1710 69..72 '101': u32
1711 84..279 '{ ...MUT; }': ()
1712 172..173 'x': u32
1713 176..188 'LOCAL_STATIC': u32
1714 198..199 'y': u32
1715 202..218 'LOCAL_...IC_MUT': u32
1716 228..229 'z': u32
1717 232..245 'GLOBAL_STATIC': u32
1718 255..256 'w': u32
1719 259..276 'GLOBAL...IC_MUT': u32
1720 117..119 '99': u32
1721 160..162 '99': u32
1722 "#]],
1723 );
1724}
1725
1726#[test]
1727fn shadowing_primitive() {
1728 check_types(
1729 r#"
1730struct i32;
1731struct Foo;
1732
1733impl i32 { fn foo(&self) -> Foo { Foo } }
1734
1735fn main() {
1736 let x: i32 = i32;
1737 x.foo();
1738 //^ Foo
1739}"#,
1740 );
1741}
1742
1743#[test]
1744fn not_shadowing_primitive_by_module() {
1745 check_types(
1746 r#"
1747//- /str.rs
1748fn foo() {}
1749
1750//- /main.rs
1751mod str;
1752fn foo() -> &'static str { "" }
1753
1754fn main() {
1755 foo();
1756 //^ &str
1757}"#,
1758 );
1759}
1760
1761#[test]
1762fn not_shadowing_module_by_primitive() {
1763 check_types(
1764 r#"
1765//- /str.rs
1766fn foo() -> u32 {0}
1767
1768//- /main.rs
1769mod str;
1770fn foo() -> &'static str { "" }
1771
1772fn main() {
1773 str::foo();
1774 //^ u32
1775}"#,
1776 );
1777}
1778
1779// This test is actually testing the shadowing behavior within hir_def. It
1780// lives here because the testing infrastructure in hir_def isn't currently
1781// capable of asserting the necessary conditions.
1782#[test]
1783fn should_be_shadowing_imports() {
1784 check_types(
1785 r#"
1786mod a {
1787 pub fn foo() -> i8 {0}
1788 pub struct foo { a: i8 }
1789}
1790mod b { pub fn foo () -> u8 {0} }
1791mod c { pub struct foo { a: u8 } }
1792mod d {
1793 pub use super::a::*;
1794 pub use super::c::foo;
1795 pub use super::b::foo;
1796}
1797
1798fn main() {
1799 d::foo();
1800 //^ u8
1801 d::foo{a:0};
1802 //^ u8
1803}"#,
1804 );
1805}
1806
1807#[test]
1808fn closure_return() {
1809 check_infer(
1810 r#"
1811 fn foo() -> u32 {
1812 let x = || -> usize { return 1; };
1813 }
1814 "#,
1815 expect![[r#"
1816 16..58 '{ ...; }; }': ()
1817 26..27 'x': || -> usize
1818 30..55 '|| -> ...n 1; }': || -> usize
1819 42..55 '{ return 1; }': usize
1820 44..52 'return 1': !
1821 51..52 '1': usize
1822 "#]],
1823 );
1824}
1825
1826#[test]
1827fn closure_return_unit() {
1828 check_infer(
1829 r#"
1830 fn foo() -> u32 {
1831 let x = || { return; };
1832 }
1833 "#,
1834 expect![[r#"
1835 16..47 '{ ...; }; }': ()
1836 26..27 'x': || -> ()
1837 30..44 '|| { return; }': || -> ()
1838 33..44 '{ return; }': ()
1839 35..41 'return': !
1840 "#]],
1841 );
1842}
1843
1844#[test]
1845fn closure_return_inferred() {
1846 check_infer(
1847 r#"
1848 fn foo() -> u32 {
1849 let x = || { "test" };
1850 }
1851 "#,
1852 expect![[r#"
1853 16..46 '{ ..." }; }': ()
1854 26..27 'x': || -> &str
1855 30..43 '|| { "test" }': || -> &str
1856 33..43 '{ "test" }': &str
1857 35..41 '"test"': &str
1858 "#]],
1859 );
1860}
1861
1862#[test]
1863fn fn_pointer_return() {
1864 check_infer(
1865 r#"
1866 struct Vtable {
1867 method: fn(),
1868 }
1869
1870 fn main() {
1871 let vtable = Vtable { method: || {} };
1872 let m = vtable.method;
1873 }
1874 "#,
1875 expect![[r#"
1876 47..120 '{ ...hod; }': ()
1877 57..63 'vtable': Vtable
1878 66..90 'Vtable...| {} }': Vtable
1879 83..88 '|| {}': || -> ()
1880 86..88 '{}': ()
1881 100..101 'm': fn()
1882 104..110 'vtable': Vtable
1883 104..117 'vtable.method': fn()
1884 "#]],
1885 );
1886}
1887
1888#[test]
1889fn effects_smoke_test() {
1890 check_infer(
1891 r#"
1892 fn main() {
1893 let x = unsafe { 92 };
1894 let y = async { async { () }.await };
1895 let z = try { () };
1896 let t = 'a: { 92 };
1897 }
1898 "#,
1899 expect![[r#"
1900 10..130 '{ ...2 }; }': ()
1901 20..21 'x': i32
1902 24..37 'unsafe { 92 }': i32
1903 31..37 '{ 92 }': i32
1904 33..35 '92': i32
1905 47..48 'y': {unknown}
1906 57..79 '{ asyn...wait }': {unknown}
1907 59..77 'async ....await': {unknown}
1908 65..71 '{ () }': ()
1909 67..69 '()': ()
1910 89..90 'z': {unknown}
1911 93..103 'try { () }': {unknown}
1912 97..103 '{ () }': ()
1913 99..101 '()': ()
1914 113..114 't': i32
1915 121..127 '{ 92 }': i32
1916 123..125 '92': i32
1917 "#]],
1918 )
1919}
1920
1921#[test]
1922fn infer_generic_from_later_assignment() {
1923 check_infer(
1924 r#"
1925 enum Option<T> { Some(T), None }
1926 use Option::*;
1927
1928 fn test() {
1929 let mut end = None;
1930 loop {
1931 end = Some(true);
1932 }
1933 }
1934 "#,
1935 expect![[r#"
1936 59..129 '{ ... } }': ()
1937 69..76 'mut end': Option<bool>
1938 79..83 'None': Option<bool>
1939 89..127 'loop {... }': !
1940 94..127 '{ ... }': ()
1941 104..107 'end': Option<bool>
1942 104..120 'end = ...(true)': ()
1943 110..114 'Some': Some<bool>(bool) -> Option<bool>
1944 110..120 'Some(true)': Option<bool>
1945 115..119 'true': bool
1946 "#]],
1947 );
1948}
1949
1950#[test]
1951fn infer_loop_break_with_val() {
1952 check_infer(
1953 r#"
1954 enum Option<T> { Some(T), None }
1955 use Option::*;
1956
1957 fn test() {
1958 let x = loop {
1959 if false {
1960 break None;
1961 }
1962
1963 break Some(true);
1964 };
1965 }
1966 "#,
1967 expect![[r#"
1968 59..168 '{ ... }; }': ()
1969 69..70 'x': Option<bool>
1970 73..165 'loop {... }': Option<bool>
1971 78..165 '{ ... }': ()
1972 88..132 'if fal... }': ()
1973 91..96 'false': bool
1974 97..132 '{ ... }': ()
1975 111..121 'break None': !
1976 117..121 'None': Option<bool>
1977 142..158 'break ...(true)': !
1978 148..152 'Some': Some<bool>(bool) -> Option<bool>
1979 148..158 'Some(true)': Option<bool>
1980 153..157 'true': bool
1981 "#]],
1982 );
1983}
1984
1985#[test]
1986fn infer_loop_break_without_val() {
1987 check_infer(
1988 r#"
1989 enum Option<T> { Some(T), None }
1990 use Option::*;
1991
1992 fn test() {
1993 let x = loop {
1994 if false {
1995 break;
1996 }
1997 };
1998 }
1999 "#,
2000 expect![[r#"
2001 59..136 '{ ... }; }': ()
2002 69..70 'x': ()
2003 73..133 'loop {... }': ()
2004 78..133 '{ ... }': ()
2005 88..127 'if fal... }': ()
2006 91..96 'false': bool
2007 97..127 '{ ... }': ()
2008 111..116 'break': !
2009 "#]],
2010 );
2011}
2012
2013#[test]
2014fn infer_labelled_break_with_val() {
2015 check_infer(
2016 r#"
2017 fn foo() {
2018 let _x = || 'outer: loop {
2019 let inner = 'inner: loop {
2020 let i = Default::default();
2021 if (break 'outer i) {
2022 loop { break 'inner 5i8; };
2023 } else if true {
2024 break 'inner 6;
2025 }
2026 break 7;
2027 };
2028 break inner < 8;
2029 };
2030 }
2031 "#,
2032 expect![[r#"
2033 9..335 '{ ... }; }': ()
2034 19..21 '_x': || -> bool
2035 24..332 '|| 'ou... }': || -> bool
2036 27..332 ''outer... }': bool
2037 40..332 '{ ... }': ()
2038 54..59 'inner': i8
2039 62..300 ''inner... }': i8
2040 75..300 '{ ... }': ()
2041 93..94 'i': bool
2042 97..113 'Defaul...efault': {unknown}
2043 97..115 'Defaul...ault()': bool
2044 129..269 'if (br... }': ()
2045 133..147 'break 'outer i': !
2046 146..147 'i': bool
2047 149..208 '{ ... }': ()
2048 167..193 'loop {...5i8; }': !
2049 172..193 '{ brea...5i8; }': ()
2050 174..190 'break ...er 5i8': !
2051 187..190 '5i8': i8
2052 214..269 'if tru... }': ()
2053 217..221 'true': bool
2054 222..269 '{ ... }': ()
2055 240..254 'break 'inner 6': !
2056 253..254 '6': i8
2057 282..289 'break 7': !
2058 288..289 '7': i8
2059 310..325 'break inner < 8': !
2060 316..321 'inner': i8
2061 316..325 'inner < 8': bool
2062 324..325 '8': i8
2063 "#]],
2064 );
2065}
2066
2067#[test]
2068fn generic_default() {
2069 check_infer(
2070 r#"
2071 struct Thing<T = ()> { t: T }
2072 enum OtherThing<T = ()> {
2073 One { t: T },
2074 Two(T),
2075 }
2076
2077 fn test(t1: Thing, t2: OtherThing, t3: Thing<i32>, t4: OtherThing<i32>) {
2078 t1.t;
2079 t3.t;
2080 match t2 {
2081 OtherThing::One { t } => { t; },
2082 OtherThing::Two(t) => { t; },
2083 }
2084 match t4 {
2085 OtherThing::One { t } => { t; },
2086 OtherThing::Two(t) => { t; },
2087 }
2088 }
2089 "#,
2090 expect![[r#"
2091 97..99 't1': Thing<()>
2092 108..110 't2': OtherThing<()>
2093 124..126 't3': Thing<i32>
2094 140..142 't4': OtherThing<i32>
2095 161..384 '{ ... } }': ()
2096 167..169 't1': Thing<()>
2097 167..171 't1.t': ()
2098 177..179 't3': Thing<i32>
2099 177..181 't3.t': i32
2100 187..282 'match ... }': ()
2101 193..195 't2': OtherThing<()>
2102 206..227 'OtherT... { t }': OtherThing<()>
2103 224..225 't': ()
2104 231..237 '{ t; }': ()
2105 233..234 't': ()
2106 247..265 'OtherT...Two(t)': OtherThing<()>
2107 263..264 't': ()
2108 269..275 '{ t; }': ()
2109 271..272 't': ()
2110 287..382 'match ... }': ()
2111 293..295 't4': OtherThing<i32>
2112 306..327 'OtherT... { t }': OtherThing<i32>
2113 324..325 't': i32
2114 331..337 '{ t; }': ()
2115 333..334 't': i32
2116 347..365 'OtherT...Two(t)': OtherThing<i32>
2117 363..364 't': i32
2118 369..375 '{ t; }': ()
2119 371..372 't': i32
2120 "#]],
2121 );
2122}
2123
2124#[test]
2125fn generic_default_in_struct_literal() {
2126 check_infer(
2127 r#"
2128 struct Thing<T = ()> { t: T }
2129 enum OtherThing<T = ()> {
2130 One { t: T },
2131 Two(T),
2132 }
2133
2134 fn test() {
2135 let x = Thing { t: loop {} };
2136 let y = Thing { t: () };
2137 let z = Thing { t: 1i32 };
2138 if let Thing { t } = z {
2139 t;
2140 }
2141
2142 let a = OtherThing::One { t: 1i32 };
2143 let b = OtherThing::Two(1i32);
2144 }
2145 "#,
2146 expect![[r#"
2147 99..319 '{ ...32); }': ()
2148 109..110 'x': Thing<!>
2149 113..133 'Thing ...p {} }': Thing<!>
2150 124..131 'loop {}': !
2151 129..131 '{}': ()
2152 143..144 'y': Thing<()>
2153 147..162 'Thing { t: () }': Thing<()>
2154 158..160 '()': ()
2155 172..173 'z': Thing<i32>
2156 176..193 'Thing ...1i32 }': Thing<i32>
2157 187..191 '1i32': i32
2158 199..240 'if let... }': ()
2159 206..217 'Thing { t }': Thing<i32>
2160 214..215 't': i32
2161 220..221 'z': Thing<i32>
2162 222..240 '{ ... }': ()
2163 232..233 't': i32
2164 250..251 'a': OtherThing<i32>
2165 254..281 'OtherT...1i32 }': OtherThing<i32>
2166 275..279 '1i32': i32
2167 291..292 'b': OtherThing<i32>
2168 295..310 'OtherThing::Two': Two<i32>(i32) -> OtherThing<i32>
2169 295..316 'OtherT...(1i32)': OtherThing<i32>
2170 311..315 '1i32': i32
2171 "#]],
2172 );
2173}
2174
2175#[test]
2176fn generic_default_depending_on_other_type_arg() {
2177 // FIXME: the {unknown} is a bug
2178 check_infer(
2179 r#"
2180 struct Thing<T = u128, F = fn() -> T> { t: T }
2181
2182 fn test(t1: Thing<u32>, t2: Thing) {
2183 t1;
2184 t2;
2185 Thing::<_> { t: 1u32 };
2186 }
2187 "#,
2188 expect![[r#"
2189 56..58 't1': Thing<u32, fn() -> u32>
2190 72..74 't2': Thing<u128, fn() -> u128>
2191 83..130 '{ ...2 }; }': ()
2192 89..91 't1': Thing<u32, fn() -> u32>
2193 97..99 't2': Thing<u128, fn() -> u128>
2194 105..127 'Thing:...1u32 }': Thing<u32, fn() -> {unknown}>
2195 121..125 '1u32': u32
2196 "#]],
2197 );
2198}
2199
2200#[test]
2201fn generic_default_depending_on_other_type_arg_forward() {
2202 // the {unknown} here is intentional, as defaults are not allowed to
2203 // refer to type parameters coming later
2204 check_infer(
2205 r#"
2206 struct Thing<F = fn() -> T, T = u128> { t: T }
2207
2208 fn test(t1: Thing) {
2209 t1;
2210 }
2211 "#,
2212 expect![[r#"
2213 56..58 't1': Thing<fn() -> {unknown}, u128>
2214 67..78 '{ t1; }': ()
2215 73..75 't1': Thing<fn() -> {unknown}, u128>
2216 "#]],
2217 );
2218}
diff --git a/crates/hir_ty/src/tests/traits.rs b/crates/hir_ty/src/tests/traits.rs
new file mode 100644
index 000000000..1f1056962
--- /dev/null
+++ b/crates/hir_ty/src/tests/traits.rs
@@ -0,0 +1,3113 @@
1use expect_test::expect;
2use test_utils::mark;
3
4use super::{check_infer, check_infer_with_mismatches, check_types};
5
6#[test]
7fn infer_await() {
8 check_types(
9 r#"
10//- /main.rs crate:main deps:core
11struct IntFuture;
12
13impl Future for IntFuture {
14 type Output = u64;
15}
16
17fn test() {
18 let r = IntFuture;
19 let v = r.await;
20 v;
21} //^ u64
22
23//- /core.rs crate:core
24#[prelude_import] use future::*;
25mod future {
26 #[lang = "future_trait"]
27 trait Future {
28 type Output;
29 }
30}
31"#,
32 );
33}
34
35#[test]
36fn infer_async() {
37 check_types(
38 r#"
39//- /main.rs crate:main deps:core
40async fn foo() -> u64 {
41 128
42}
43
44fn test() {
45 let r = foo();
46 let v = r.await;
47 v;
48} //^ u64
49
50//- /core.rs crate:core
51#[prelude_import] use future::*;
52mod future {
53 #[lang = "future_trait"]
54 trait Future {
55 type Output;
56 }
57}
58"#,
59 );
60}
61
62#[test]
63fn infer_desugar_async() {
64 check_types(
65 r#"
66//- /main.rs crate:main deps:core
67async fn foo() -> u64 {
68 128
69}
70
71fn test() {
72 let r = foo();
73 r;
74} //^ impl Future<Output = u64>
75
76//- /core.rs crate:core
77#[prelude_import] use future::*;
78mod future {
79 trait Future {
80 type Output;
81 }
82}
83
84"#,
85 );
86}
87
88#[test]
89fn infer_try() {
90 check_types(
91 r#"
92//- /main.rs crate:main deps:core
93fn test() {
94 let r: Result<i32, u64> = Result::Ok(1);
95 let v = r?;
96 v;
97} //^ i32
98
99//- /core.rs crate:core
100#[prelude_import] use ops::*;
101mod ops {
102 trait Try {
103 type Ok;
104 type Error;
105 }
106}
107
108#[prelude_import] use result::*;
109mod result {
110 enum Result<O, E> {
111 Ok(O),
112 Err(E)
113 }
114
115 impl<O, E> crate::ops::Try for Result<O, E> {
116 type Ok = O;
117 type Error = E;
118 }
119}
120"#,
121 );
122}
123
124#[test]
125fn infer_for_loop() {
126 check_types(
127 r#"
128//- /main.rs crate:main deps:core,alloc
129use alloc::collections::Vec;
130
131fn test() {
132 let v = Vec::new();
133 v.push("foo");
134 for x in v {
135 x;
136 } //^ &str
137}
138
139//- /core.rs crate:core
140#[prelude_import] use iter::*;
141mod iter {
142 trait IntoIterator {
143 type Item;
144 }
145}
146
147//- /alloc.rs crate:alloc deps:core
148mod collections {
149 struct Vec<T> {}
150 impl<T> Vec<T> {
151 fn new() -> Self { Vec {} }
152 fn push(&mut self, t: T) { }
153 }
154
155 impl<T> IntoIterator for Vec<T> {
156 type Item=T;
157 }
158}
159"#,
160 );
161}
162
163#[test]
164fn infer_ops_neg() {
165 check_types(
166 r#"
167//- /main.rs crate:main deps:std
168struct Bar;
169struct Foo;
170
171impl std::ops::Neg for Bar {
172 type Output = Foo;
173}
174
175fn test() {
176 let a = Bar;
177 let b = -a;
178 b;
179} //^ Foo
180
181//- /std.rs crate:std
182#[prelude_import] use ops::*;
183mod ops {
184 #[lang = "neg"]
185 pub trait Neg {
186 type Output;
187 }
188}
189"#,
190 );
191}
192
193#[test]
194fn infer_ops_not() {
195 check_types(
196 r#"
197//- /main.rs crate:main deps:std
198struct Bar;
199struct Foo;
200
201impl std::ops::Not for Bar {
202 type Output = Foo;
203}
204
205fn test() {
206 let a = Bar;
207 let b = !a;
208 b;
209} //^ Foo
210
211//- /std.rs crate:std
212#[prelude_import] use ops::*;
213mod ops {
214 #[lang = "not"]
215 pub trait Not {
216 type Output;
217 }
218}
219"#,
220 );
221}
222
223#[test]
224fn infer_from_bound_1() {
225 check_infer(
226 r#"
227 trait Trait<T> {}
228 struct S<T>(T);
229 impl<U> Trait<U> for S<U> {}
230 fn foo<T: Trait<u32>>(t: T) {}
231 fn test() {
232 let s = S(unknown);
233 foo(s);
234 }
235 "#,
236 expect![[r#"
237 85..86 't': T
238 91..93 '{}': ()
239 104..143 '{ ...(s); }': ()
240 114..115 's': S<u32>
241 118..119 'S': S<u32>(u32) -> S<u32>
242 118..128 'S(unknown)': S<u32>
243 120..127 'unknown': u32
244 134..137 'foo': fn foo<S<u32>>(S<u32>)
245 134..140 'foo(s)': ()
246 138..139 's': S<u32>
247 "#]],
248 );
249}
250
251#[test]
252fn infer_from_bound_2() {
253 check_infer(
254 r#"
255 trait Trait<T> {}
256 struct S<T>(T);
257 impl<U> Trait<U> for S<U> {}
258 fn foo<U, T: Trait<U>>(t: T) -> U {}
259 fn test() {
260 let s = S(unknown);
261 let x: u32 = foo(s);
262 }
263 "#,
264 expect![[r#"
265 86..87 't': T
266 97..99 '{}': ()
267 110..162 '{ ...(s); }': ()
268 120..121 's': S<u32>
269 124..125 'S': S<u32>(u32) -> S<u32>
270 124..134 'S(unknown)': S<u32>
271 126..133 'unknown': u32
272 144..145 'x': u32
273 153..156 'foo': fn foo<u32, S<u32>>(S<u32>) -> u32
274 153..159 'foo(s)': u32
275 157..158 's': S<u32>
276 "#]],
277 );
278}
279
280#[test]
281fn trait_default_method_self_bound_implements_trait() {
282 mark::check!(trait_self_implements_self);
283 check_infer(
284 r#"
285 trait Trait {
286 fn foo(&self) -> i64;
287 fn bar(&self) -> {
288 let x = self.foo();
289 }
290 }
291 "#,
292 expect![[r#"
293 26..30 'self': &Self
294 52..56 'self': &Self
295 61..96 '{ ... }': ()
296 75..76 'x': i64
297 79..83 'self': &Self
298 79..89 'self.foo()': i64
299 "#]],
300 );
301}
302
303#[test]
304fn trait_default_method_self_bound_implements_super_trait() {
305 check_infer(
306 r#"
307 trait SuperTrait {
308 fn foo(&self) -> i64;
309 }
310 trait Trait: SuperTrait {
311 fn bar(&self) -> {
312 let x = self.foo();
313 }
314 }
315 "#,
316 expect![[r#"
317 31..35 'self': &Self
318 85..89 'self': &Self
319 94..129 '{ ... }': ()
320 108..109 'x': i64
321 112..116 'self': &Self
322 112..122 'self.foo()': i64
323 "#]],
324 );
325}
326
327#[test]
328fn infer_project_associated_type() {
329 check_infer(
330 r#"
331 trait Iterable {
332 type Item;
333 }
334 struct S;
335 impl Iterable for S { type Item = u32; }
336 fn test<T: Iterable>() {
337 let x: <S as Iterable>::Item = 1;
338 let y: <T as Iterable>::Item = no_matter;
339 let z: T::Item = no_matter;
340 let a: <T>::Item = no_matter;
341 }
342 "#,
343 expect![[r#"
344 108..261 '{ ...ter; }': ()
345 118..119 'x': u32
346 145..146 '1': u32
347 156..157 'y': Iterable::Item<T>
348 183..192 'no_matter': Iterable::Item<T>
349 202..203 'z': Iterable::Item<T>
350 215..224 'no_matter': Iterable::Item<T>
351 234..235 'a': Iterable::Item<T>
352 249..258 'no_matter': Iterable::Item<T>
353 "#]],
354 );
355}
356
357#[test]
358fn infer_return_associated_type() {
359 check_infer(
360 r#"
361 trait Iterable {
362 type Item;
363 }
364 struct S;
365 impl Iterable for S { type Item = u32; }
366 fn foo1<T: Iterable>(t: T) -> T::Item {}
367 fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item {}
368 fn foo3<T: Iterable>(t: T) -> <T>::Item {}
369 fn test() {
370 let x = foo1(S);
371 let y = foo2(S);
372 let z = foo3(S);
373 }
374 "#,
375 expect![[r#"
376 106..107 't': T
377 123..125 '{}': ()
378 147..148 't': T
379 178..180 '{}': ()
380 202..203 't': T
381 221..223 '{}': ()
382 234..300 '{ ...(S); }': ()
383 244..245 'x': u32
384 248..252 'foo1': fn foo1<S>(S) -> <S as Iterable>::Item
385 248..255 'foo1(S)': u32
386 253..254 'S': S
387 265..266 'y': u32
388 269..273 'foo2': fn foo2<S>(S) -> <S as Iterable>::Item
389 269..276 'foo2(S)': u32
390 274..275 'S': S
391 286..287 'z': u32
392 290..294 'foo3': fn foo3<S>(S) -> <S as Iterable>::Item
393 290..297 'foo3(S)': u32
394 295..296 'S': S
395 "#]],
396 );
397}
398
399#[test]
400fn infer_associated_type_bound() {
401 check_infer(
402 r#"
403 trait Iterable {
404 type Item;
405 }
406 fn test<T: Iterable<Item=u32>>() {
407 let y: T::Item = unknown;
408 }
409 "#,
410 expect![[r#"
411 67..100 '{ ...own; }': ()
412 77..78 'y': u32
413 90..97 'unknown': u32
414 "#]],
415 );
416}
417
418#[test]
419fn infer_const_body() {
420 check_infer(
421 r#"
422 const A: u32 = 1 + 1;
423 static B: u64 = { let x = 1; x };
424 "#,
425 expect![[r#"
426 15..16 '1': u32
427 15..20 '1 + 1': u32
428 19..20 '1': u32
429 38..54 '{ let ...1; x }': u64
430 44..45 'x': u64
431 48..49 '1': u64
432 51..52 'x': u64
433 "#]],
434 );
435}
436
437#[test]
438fn tuple_struct_fields() {
439 check_infer(
440 r#"
441 struct S(i32, u64);
442 fn test() -> u64 {
443 let a = S(4, 6);
444 let b = a.0;
445 a.1
446 }
447 "#,
448 expect![[r#"
449 37..86 '{ ... a.1 }': u64
450 47..48 'a': S
451 51..52 'S': S(i32, u64) -> S
452 51..58 'S(4, 6)': S
453 53..54 '4': i32
454 56..57 '6': u64
455 68..69 'b': i32
456 72..73 'a': S
457 72..75 'a.0': i32
458 81..82 'a': S
459 81..84 'a.1': u64
460 "#]],
461 );
462}
463
464#[test]
465fn tuple_struct_with_fn() {
466 check_infer(
467 r#"
468 struct S(fn(u32) -> u64);
469 fn test() -> u64 {
470 let a = S(|i| 2*i);
471 let b = a.0(4);
472 a.0(2)
473 }
474 "#,
475 expect![[r#"
476 43..101 '{ ...0(2) }': u64
477 53..54 'a': S
478 57..58 'S': S(fn(u32) -> u64) -> S
479 57..67 'S(|i| 2*i)': S
480 59..66 '|i| 2*i': |u32| -> u64
481 60..61 'i': u32
482 63..64 '2': u32
483 63..66 '2*i': u32
484 65..66 'i': u32
485 77..78 'b': u64
486 81..82 'a': S
487 81..84 'a.0': fn(u32) -> u64
488 81..87 'a.0(4)': u64
489 85..86 '4': u32
490 93..94 'a': S
491 93..96 'a.0': fn(u32) -> u64
492 93..99 'a.0(2)': u64
493 97..98 '2': u32
494 "#]],
495 );
496}
497
498#[test]
499fn indexing_arrays() {
500 check_infer(
501 "fn main() { &mut [9][2]; }",
502 expect![[r#"
503 10..26 '{ &mut...[2]; }': ()
504 12..23 '&mut [9][2]': &mut {unknown}
505 17..20 '[9]': [i32; _]
506 17..23 '[9][2]': {unknown}
507 18..19 '9': i32
508 21..22 '2': i32
509 "#]],
510 )
511}
512
513#[test]
514fn infer_ops_index() {
515 check_types(
516 r#"
517//- /main.rs crate:main deps:std
518struct Bar;
519struct Foo;
520
521impl std::ops::Index<u32> for Bar {
522 type Output = Foo;
523}
524
525fn test() {
526 let a = Bar;
527 let b = a[1u32];
528 b;
529} //^ Foo
530
531//- /std.rs crate:std
532#[prelude_import] use ops::*;
533mod ops {
534 #[lang = "index"]
535 pub trait Index<Idx> {
536 type Output;
537 }
538}
539"#,
540 );
541}
542
543#[test]
544fn infer_ops_index_int() {
545 check_types(
546 r#"
547//- /main.rs crate:main deps:std
548struct Bar;
549struct Foo;
550
551impl std::ops::Index<u32> for Bar {
552 type Output = Foo;
553}
554
555struct Range;
556impl std::ops::Index<Range> for Bar {
557 type Output = Bar;
558}
559
560fn test() {
561 let a = Bar;
562 let b = a[1];
563 b;
564 //^ Foo
565}
566
567//- /std.rs crate:std
568#[prelude_import] use ops::*;
569mod ops {
570 #[lang = "index"]
571 pub trait Index<Idx> {
572 type Output;
573 }
574}
575"#,
576 );
577}
578
579#[test]
580fn infer_ops_index_autoderef() {
581 check_types(
582 r#"
583//- /main.rs crate:main deps:std
584fn test() {
585 let a = &[1u32, 2, 3];
586 let b = a[1u32];
587 b;
588} //^ u32
589
590//- /std.rs crate:std
591impl<T> ops::Index<u32> for [T] {
592 type Output = T;
593}
594
595#[prelude_import] use ops::*;
596mod ops {
597 #[lang = "index"]
598 pub trait Index<Idx> {
599 type Output;
600 }
601}
602"#,
603 );
604}
605
606#[test]
607fn deref_trait() {
608 check_types(
609 r#"
610#[lang = "deref"]
611trait Deref {
612 type Target;
613 fn deref(&self) -> &Self::Target;
614}
615
616struct Arc<T>;
617impl<T> Deref for Arc<T> {
618 type Target = T;
619}
620
621struct S;
622impl S {
623 fn foo(&self) -> u128 {}
624}
625
626fn test(s: Arc<S>) {
627 (*s, s.foo());
628} //^ (S, u128)
629"#,
630 );
631}
632
633#[test]
634fn deref_trait_with_inference_var() {
635 check_types(
636 r#"
637//- /main.rs
638#[lang = "deref"]
639trait Deref {
640 type Target;
641 fn deref(&self) -> &Self::Target;
642}
643
644struct Arc<T>;
645fn new_arc<T>() -> Arc<T> {}
646impl<T> Deref for Arc<T> {
647 type Target = T;
648}
649
650struct S;
651fn foo(a: Arc<S>) {}
652
653fn test() {
654 let a = new_arc();
655 let b = (*a);
656 //^ S
657 foo(a);
658}
659"#,
660 );
661}
662
663#[test]
664fn deref_trait_infinite_recursion() {
665 check_types(
666 r#"
667#[lang = "deref"]
668trait Deref {
669 type Target;
670 fn deref(&self) -> &Self::Target;
671}
672
673struct S;
674
675impl Deref for S {
676 type Target = S;
677}
678
679fn test(s: S) {
680 s.foo();
681} //^ {unknown}
682"#,
683 );
684}
685
686#[test]
687fn deref_trait_with_question_mark_size() {
688 check_types(
689 r#"
690#[lang = "deref"]
691trait Deref {
692 type Target;
693 fn deref(&self) -> &Self::Target;
694}
695
696struct Arc<T>;
697impl<T> Deref for Arc<T> {
698 type Target = T;
699}
700
701struct S;
702impl S {
703 fn foo(&self) -> u128 {}
704}
705
706fn test(s: Arc<S>) {
707 (*s, s.foo());
708} //^ (S, u128)
709"#,
710 );
711}
712
713#[test]
714fn obligation_from_function_clause() {
715 check_types(
716 r#"
717struct S;
718
719trait Trait<T> {}
720impl Trait<u32> for S {}
721
722fn foo<T: Trait<U>, U>(t: T) -> U {}
723
724fn test(s: S) {
725 (foo(s));
726} //^ u32
727"#,
728 );
729}
730
731#[test]
732fn obligation_from_method_clause() {
733 check_types(
734 r#"
735//- /main.rs
736struct S;
737
738trait Trait<T> {}
739impl Trait<isize> for S {}
740
741struct O;
742impl O {
743 fn foo<T: Trait<U>, U>(&self, t: T) -> U {}
744}
745
746fn test() {
747 O.foo(S);
748} //^ isize
749"#,
750 );
751}
752
753#[test]
754fn obligation_from_self_method_clause() {
755 check_types(
756 r#"
757struct S;
758
759trait Trait<T> {}
760impl Trait<i64> for S {}
761
762impl S {
763 fn foo<U>(&self) -> U where Self: Trait<U> {}
764}
765
766fn test() {
767 S.foo();
768} //^ i64
769"#,
770 );
771}
772
773#[test]
774fn obligation_from_impl_clause() {
775 check_types(
776 r#"
777struct S;
778
779trait Trait<T> {}
780impl Trait<&str> for S {}
781
782struct O<T>;
783impl<U, T: Trait<U>> O<T> {
784 fn foo(&self) -> U {}
785}
786
787fn test(o: O<S>) {
788 o.foo();
789} //^ &str
790"#,
791 );
792}
793
794#[test]
795fn generic_param_env_1() {
796 check_types(
797 r#"
798trait Clone {}
799trait Trait { fn foo(self) -> u128; }
800struct S;
801impl Clone for S {}
802impl<T> Trait for T where T: Clone {}
803fn test<T: Clone>(t: T) { t.foo(); }
804 //^ u128
805"#,
806 );
807}
808
809#[test]
810fn generic_param_env_1_not_met() {
811 check_types(
812 r#"
813//- /main.rs
814trait Clone {}
815trait Trait { fn foo(self) -> u128; }
816struct S;
817impl Clone for S {}
818impl<T> Trait for T where T: Clone {}
819fn test<T>(t: T) { t.foo(); }
820 //^ {unknown}
821"#,
822 );
823}
824
825#[test]
826fn generic_param_env_2() {
827 check_types(
828 r#"
829trait Trait { fn foo(self) -> u128; }
830struct S;
831impl Trait for S {}
832fn test<T: Trait>(t: T) { t.foo(); }
833 //^ u128
834"#,
835 );
836}
837
838#[test]
839fn generic_param_env_2_not_met() {
840 check_types(
841 r#"
842trait Trait { fn foo(self) -> u128; }
843struct S;
844impl Trait for S {}
845fn test<T>(t: T) { t.foo(); }
846 //^ {unknown}
847"#,
848 );
849}
850
851#[test]
852fn generic_param_env_deref() {
853 check_types(
854 r#"
855#[lang = "deref"]
856trait Deref {
857 type Target;
858}
859trait Trait {}
860impl<T> Deref for T where T: Trait {
861 type Target = i128;
862}
863fn test<T: Trait>(t: T) { (*t); }
864 //^ i128
865"#,
866 );
867}
868
869#[test]
870fn associated_type_placeholder() {
871 // inside the generic function, the associated type gets normalized to a placeholder `ApplL::Out<T>` [https://rust-lang.github.io/rustc-guide/traits/associated-types.html#placeholder-associated-types].
872 check_types(
873 r#"
874pub trait ApplyL {
875 type Out;
876}
877
878pub struct RefMutL<T>;
879
880impl<T> ApplyL for RefMutL<T> {
881 type Out = <T as ApplyL>::Out;
882}
883
884fn test<T: ApplyL>() {
885 let y: <RefMutL<T> as ApplyL>::Out = no_matter;
886 y;
887} //^ ApplyL::Out<T>
888"#,
889 );
890}
891
892#[test]
893fn associated_type_placeholder_2() {
894 check_types(
895 r#"
896pub trait ApplyL {
897 type Out;
898}
899fn foo<T: ApplyL>(t: T) -> <T as ApplyL>::Out;
900
901fn test<T: ApplyL>(t: T) {
902 let y = foo(t);
903 y;
904} //^ ApplyL::Out<T>
905"#,
906 );
907}
908
909#[test]
910fn argument_impl_trait() {
911 check_infer_with_mismatches(
912 r#"
913 trait Trait<T> {
914 fn foo(&self) -> T;
915 fn foo2(&self) -> i64;
916 }
917 fn bar(x: impl Trait<u16>) {}
918 struct S<T>(T);
919 impl<T> Trait<T> for S<T> {}
920
921 fn test(x: impl Trait<u64>, y: &impl Trait<u32>) {
922 x;
923 y;
924 let z = S(1);
925 bar(z);
926 x.foo();
927 y.foo();
928 z.foo();
929 x.foo2();
930 y.foo2();
931 z.foo2();
932 }
933 "#,
934 expect![[r#"
935 29..33 'self': &Self
936 54..58 'self': &Self
937 77..78 'x': impl Trait<u16>
938 97..99 '{}': ()
939 154..155 'x': impl Trait<u64>
940 174..175 'y': &impl Trait<u32>
941 195..323 '{ ...2(); }': ()
942 201..202 'x': impl Trait<u64>
943 208..209 'y': &impl Trait<u32>
944 219..220 'z': S<u16>
945 223..224 'S': S<u16>(u16) -> S<u16>
946 223..227 'S(1)': S<u16>
947 225..226 '1': u16
948 233..236 'bar': fn bar(S<u16>)
949 233..239 'bar(z)': ()
950 237..238 'z': S<u16>
951 245..246 'x': impl Trait<u64>
952 245..252 'x.foo()': u64
953 258..259 'y': &impl Trait<u32>
954 258..265 'y.foo()': u32
955 271..272 'z': S<u16>
956 271..278 'z.foo()': u16
957 284..285 'x': impl Trait<u64>
958 284..292 'x.foo2()': i64
959 298..299 'y': &impl Trait<u32>
960 298..306 'y.foo2()': i64
961 312..313 'z': S<u16>
962 312..320 'z.foo2()': i64
963 "#]],
964 );
965}
966
967#[test]
968fn argument_impl_trait_type_args_1() {
969 check_infer_with_mismatches(
970 r#"
971 trait Trait {}
972 trait Foo {
973 // this function has an implicit Self param, an explicit type param,
974 // and an implicit impl Trait param!
975 fn bar<T>(x: impl Trait) -> T { loop {} }
976 }
977 fn foo<T>(x: impl Trait) -> T { loop {} }
978 struct S;
979 impl Trait for S {}
980 struct F;
981 impl Foo for F {}
982
983 fn test() {
984 Foo::bar(S);
985 <F as Foo>::bar(S);
986 F::bar(S);
987 Foo::bar::<u32>(S);
988 <F as Foo>::bar::<u32>(S);
989
990 foo(S);
991 foo::<u32>(S);
992 foo::<u32, i32>(S); // we should ignore the extraneous i32
993 }
994 "#,
995 expect![[r#"
996 155..156 'x': impl Trait
997 175..186 '{ loop {} }': T
998 177..184 'loop {}': !
999 182..184 '{}': ()
1000 199..200 'x': impl Trait
1001 219..230 '{ loop {} }': T
1002 221..228 'loop {}': !
1003 226..228 '{}': ()
1004 300..509 '{ ... i32 }': ()
1005 306..314 'Foo::bar': fn bar<{unknown}, {unknown}>(S) -> {unknown}
1006 306..317 'Foo::bar(S)': {unknown}
1007 315..316 'S': S
1008 323..338 '<F as Foo>::bar': fn bar<F, {unknown}>(S) -> {unknown}
1009 323..341 '<F as ...bar(S)': {unknown}
1010 339..340 'S': S
1011 347..353 'F::bar': fn bar<F, {unknown}>(S) -> {unknown}
1012 347..356 'F::bar(S)': {unknown}
1013 354..355 'S': S
1014 362..377 'Foo::bar::<u32>': fn bar<{unknown}, u32>(S) -> u32
1015 362..380 'Foo::b...32>(S)': u32
1016 378..379 'S': S
1017 386..408 '<F as ...:<u32>': fn bar<F, u32>(S) -> u32
1018 386..411 '<F as ...32>(S)': u32
1019 409..410 'S': S
1020 418..421 'foo': fn foo<{unknown}>(S) -> {unknown}
1021 418..424 'foo(S)': {unknown}
1022 422..423 'S': S
1023 430..440 'foo::<u32>': fn foo<u32>(S) -> u32
1024 430..443 'foo::<u32>(S)': u32
1025 441..442 'S': S
1026 449..464 'foo::<u32, i32>': fn foo<u32>(S) -> u32
1027 449..467 'foo::<...32>(S)': u32
1028 465..466 'S': S
1029 "#]],
1030 );
1031}
1032
1033#[test]
1034fn argument_impl_trait_type_args_2() {
1035 check_infer_with_mismatches(
1036 r#"
1037 trait Trait {}
1038 struct S;
1039 impl Trait for S {}
1040 struct F<T>;
1041 impl<T> F<T> {
1042 fn foo<U>(self, x: impl Trait) -> (T, U) { loop {} }
1043 }
1044
1045 fn test() {
1046 F.foo(S);
1047 F::<u32>.foo(S);
1048 F::<u32>.foo::<i32>(S);
1049 F::<u32>.foo::<i32, u32>(S); // extraneous argument should be ignored
1050 }
1051 "#,
1052 expect![[r#"
1053 87..91 'self': F<T>
1054 93..94 'x': impl Trait
1055 118..129 '{ loop {} }': (T, U)
1056 120..127 'loop {}': !
1057 125..127 '{}': ()
1058 143..283 '{ ...ored }': ()
1059 149..150 'F': F<{unknown}>
1060 149..157 'F.foo(S)': ({unknown}, {unknown})
1061 155..156 'S': S
1062 163..171 'F::<u32>': F<u32>
1063 163..178 'F::<u32>.foo(S)': (u32, {unknown})
1064 176..177 'S': S
1065 184..192 'F::<u32>': F<u32>
1066 184..206 'F::<u3...32>(S)': (u32, i32)
1067 204..205 'S': S
1068 212..220 'F::<u32>': F<u32>
1069 212..239 'F::<u3...32>(S)': (u32, i32)
1070 237..238 'S': S
1071 "#]],
1072 );
1073}
1074
1075#[test]
1076fn argument_impl_trait_to_fn_pointer() {
1077 check_infer_with_mismatches(
1078 r#"
1079 trait Trait {}
1080 fn foo(x: impl Trait) { loop {} }
1081 struct S;
1082 impl Trait for S {}
1083
1084 fn test() {
1085 let f: fn(S) -> () = foo;
1086 }
1087 "#,
1088 expect![[r#"
1089 22..23 'x': impl Trait
1090 37..48 '{ loop {} }': ()
1091 39..46 'loop {}': !
1092 44..46 '{}': ()
1093 90..123 '{ ...foo; }': ()
1094 100..101 'f': fn(S)
1095 117..120 'foo': fn foo(S)
1096 "#]],
1097 );
1098}
1099
1100#[test]
1101fn impl_trait() {
1102 check_infer(
1103 r#"
1104 trait Trait<T> {
1105 fn foo(&self) -> T;
1106 fn foo2(&self) -> i64;
1107 }
1108 fn bar() -> impl Trait<u64> {}
1109
1110 fn test(x: impl Trait<u64>, y: &impl Trait<u64>) {
1111 x;
1112 y;
1113 let z = bar();
1114 x.foo();
1115 y.foo();
1116 z.foo();
1117 x.foo2();
1118 y.foo2();
1119 z.foo2();
1120 }
1121 "#,
1122 expect![[r#"
1123 29..33 'self': &Self
1124 54..58 'self': &Self
1125 98..100 '{}': ()
1126 110..111 'x': impl Trait<u64>
1127 130..131 'y': &impl Trait<u64>
1128 151..268 '{ ...2(); }': ()
1129 157..158 'x': impl Trait<u64>
1130 164..165 'y': &impl Trait<u64>
1131 175..176 'z': impl Trait<u64>
1132 179..182 'bar': fn bar() -> impl Trait<u64>
1133 179..184 'bar()': impl Trait<u64>
1134 190..191 'x': impl Trait<u64>
1135 190..197 'x.foo()': u64
1136 203..204 'y': &impl Trait<u64>
1137 203..210 'y.foo()': u64
1138 216..217 'z': impl Trait<u64>
1139 216..223 'z.foo()': u64
1140 229..230 'x': impl Trait<u64>
1141 229..237 'x.foo2()': i64
1142 243..244 'y': &impl Trait<u64>
1143 243..251 'y.foo2()': i64
1144 257..258 'z': impl Trait<u64>
1145 257..265 'z.foo2()': i64
1146 "#]],
1147 );
1148}
1149
1150#[test]
1151fn simple_return_pos_impl_trait() {
1152 mark::check!(lower_rpit);
1153 check_infer(
1154 r#"
1155 trait Trait<T> {
1156 fn foo(&self) -> T;
1157 }
1158 fn bar() -> impl Trait<u64> { loop {} }
1159
1160 fn test() {
1161 let a = bar();
1162 a.foo();
1163 }
1164 "#,
1165 expect![[r#"
1166 29..33 'self': &Self
1167 71..82 '{ loop {} }': !
1168 73..80 'loop {}': !
1169 78..80 '{}': ()
1170 94..129 '{ ...o(); }': ()
1171 104..105 'a': impl Trait<u64>
1172 108..111 'bar': fn bar() -> impl Trait<u64>
1173 108..113 'bar()': impl Trait<u64>
1174 119..120 'a': impl Trait<u64>
1175 119..126 'a.foo()': u64
1176 "#]],
1177 );
1178}
1179
1180#[test]
1181fn more_return_pos_impl_trait() {
1182 check_infer(
1183 r#"
1184 trait Iterator {
1185 type Item;
1186 fn next(&mut self) -> Self::Item;
1187 }
1188 trait Trait<T> {
1189 fn foo(&self) -> T;
1190 }
1191 fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>) { loop {} }
1192 fn baz<T>(t: T) -> (impl Iterator<Item = impl Trait<T>>, impl Trait<T>) { loop {} }
1193
1194 fn test() {
1195 let (a, b) = bar();
1196 a.next().foo();
1197 b.foo();
1198 let (c, d) = baz(1u128);
1199 c.next().foo();
1200 d.foo();
1201 }
1202 "#,
1203 expect![[r#"
1204 49..53 'self': &mut Self
1205 101..105 'self': &Self
1206 184..195 '{ loop {} }': ({unknown}, {unknown})
1207 186..193 'loop {}': !
1208 191..193 '{}': ()
1209 206..207 't': T
1210 268..279 '{ loop {} }': ({unknown}, {unknown})
1211 270..277 'loop {}': !
1212 275..277 '{}': ()
1213 291..413 '{ ...o(); }': ()
1214 301..307 '(a, b)': (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
1215 302..303 'a': impl Iterator<Item = impl Trait<u32>>
1216 305..306 'b': impl Trait<u64>
1217 310..313 'bar': fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
1218 310..315 'bar()': (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
1219 321..322 'a': impl Iterator<Item = impl Trait<u32>>
1220 321..329 'a.next()': impl Trait<u32>
1221 321..335 'a.next().foo()': u32
1222 341..342 'b': impl Trait<u64>
1223 341..348 'b.foo()': u64
1224 358..364 '(c, d)': (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
1225 359..360 'c': impl Iterator<Item = impl Trait<u128>>
1226 362..363 'd': impl Trait<u128>
1227 367..370 'baz': fn baz<u128>(u128) -> (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
1228 367..377 'baz(1u128)': (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
1229 371..376 '1u128': u128
1230 383..384 'c': impl Iterator<Item = impl Trait<u128>>
1231 383..391 'c.next()': impl Trait<u128>
1232 383..397 'c.next().foo()': u128
1233 403..404 'd': impl Trait<u128>
1234 403..410 'd.foo()': u128
1235 "#]],
1236 );
1237}
1238
1239#[test]
1240fn dyn_trait() {
1241 check_infer(
1242 r#"
1243 trait Trait<T> {
1244 fn foo(&self) -> T;
1245 fn foo2(&self) -> i64;
1246 }
1247 fn bar() -> dyn Trait<u64> {}
1248
1249 fn test(x: dyn Trait<u64>, y: &dyn Trait<u64>) {
1250 x;
1251 y;
1252 let z = bar();
1253 x.foo();
1254 y.foo();
1255 z.foo();
1256 x.foo2();
1257 y.foo2();
1258 z.foo2();
1259 }
1260 "#,
1261 expect![[r#"
1262 29..33 'self': &Self
1263 54..58 'self': &Self
1264 97..99 '{}': ()
1265 109..110 'x': dyn Trait<u64>
1266 128..129 'y': &dyn Trait<u64>
1267 148..265 '{ ...2(); }': ()
1268 154..155 'x': dyn Trait<u64>
1269 161..162 'y': &dyn Trait<u64>
1270 172..173 'z': dyn Trait<u64>
1271 176..179 'bar': fn bar() -> dyn Trait<u64>
1272 176..181 'bar()': dyn Trait<u64>
1273 187..188 'x': dyn Trait<u64>
1274 187..194 'x.foo()': u64
1275 200..201 'y': &dyn Trait<u64>
1276 200..207 'y.foo()': u64
1277 213..214 'z': dyn Trait<u64>
1278 213..220 'z.foo()': u64
1279 226..227 'x': dyn Trait<u64>
1280 226..234 'x.foo2()': i64
1281 240..241 'y': &dyn Trait<u64>
1282 240..248 'y.foo2()': i64
1283 254..255 'z': dyn Trait<u64>
1284 254..262 'z.foo2()': i64
1285 "#]],
1286 );
1287}
1288
1289#[test]
1290fn dyn_trait_in_impl() {
1291 check_infer(
1292 r#"
1293 trait Trait<T, U> {
1294 fn foo(&self) -> (T, U);
1295 }
1296 struct S<T, U> {}
1297 impl<T, U> S<T, U> {
1298 fn bar(&self) -> &dyn Trait<T, U> { loop {} }
1299 }
1300 trait Trait2<T, U> {
1301 fn baz(&self) -> (T, U);
1302 }
1303 impl<T, U> Trait2<T, U> for dyn Trait<T, U> { }
1304
1305 fn test(s: S<u32, i32>) {
1306 s.bar().baz();
1307 }
1308 "#,
1309 expect![[r#"
1310 32..36 'self': &Self
1311 102..106 'self': &S<T, U>
1312 128..139 '{ loop {} }': &dyn Trait<T, U>
1313 130..137 'loop {}': !
1314 135..137 '{}': ()
1315 175..179 'self': &Self
1316 251..252 's': S<u32, i32>
1317 267..289 '{ ...z(); }': ()
1318 273..274 's': S<u32, i32>
1319 273..280 's.bar()': &dyn Trait<u32, i32>
1320 273..286 's.bar().baz()': (u32, i32)
1321 "#]],
1322 );
1323}
1324
1325#[test]
1326fn dyn_trait_bare() {
1327 check_infer(
1328 r#"
1329 trait Trait {
1330 fn foo(&self) -> u64;
1331 }
1332 fn bar() -> Trait {}
1333
1334 fn test(x: Trait, y: &Trait) -> u64 {
1335 x;
1336 y;
1337 let z = bar();
1338 x.foo();
1339 y.foo();
1340 z.foo();
1341 }
1342 "#,
1343 expect![[r#"
1344 26..30 'self': &Self
1345 60..62 '{}': ()
1346 72..73 'x': dyn Trait
1347 82..83 'y': &dyn Trait
1348 100..175 '{ ...o(); }': ()
1349 106..107 'x': dyn Trait
1350 113..114 'y': &dyn Trait
1351 124..125 'z': dyn Trait
1352 128..131 'bar': fn bar() -> dyn Trait
1353 128..133 'bar()': dyn Trait
1354 139..140 'x': dyn Trait
1355 139..146 'x.foo()': u64
1356 152..153 'y': &dyn Trait
1357 152..159 'y.foo()': u64
1358 165..166 'z': dyn Trait
1359 165..172 'z.foo()': u64
1360 "#]],
1361 );
1362}
1363
1364#[test]
1365fn weird_bounds() {
1366 check_infer(
1367 r#"
1368 trait Trait {}
1369 fn test(a: impl Trait + 'lifetime, b: impl 'lifetime, c: impl (Trait), d: impl ('lifetime), e: impl ?Sized, f: impl Trait + ?Sized) {}
1370 "#,
1371 expect![[r#"
1372 23..24 'a': impl Trait + {error}
1373 50..51 'b': impl {error}
1374 69..70 'c': impl Trait
1375 86..87 'd': impl {error}
1376 107..108 'e': impl {error}
1377 123..124 'f': impl Trait + {error}
1378 147..149 '{}': ()
1379 "#]],
1380 );
1381}
1382
1383#[test]
1384#[ignore]
1385fn error_bound_chalk() {
1386 check_types(
1387 r#"
1388trait Trait {
1389 fn foo(&self) -> u32 {}
1390}
1391
1392fn test(x: (impl Trait + UnknownTrait)) {
1393 x.foo();
1394} //^ u32
1395"#,
1396 );
1397}
1398
1399#[test]
1400fn assoc_type_bindings() {
1401 check_infer(
1402 r#"
1403 trait Trait {
1404 type Type;
1405 }
1406
1407 fn get<T: Trait>(t: T) -> <T as Trait>::Type {}
1408 fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
1409 fn set<T: Trait<Type = u64>>(t: T) -> T {t}
1410
1411 struct S<T>;
1412 impl<T> Trait for S<T> { type Type = T; }
1413
1414 fn test<T: Trait<Type = u32>>(x: T, y: impl Trait<Type = i64>) {
1415 get(x);
1416 get2(x);
1417 get(y);
1418 get2(y);
1419 get(set(S));
1420 get2(set(S));
1421 get2(S::<str>);
1422 }
1423 "#,
1424 expect![[r#"
1425 49..50 't': T
1426 77..79 '{}': ()
1427 111..112 't': T
1428 122..124 '{}': ()
1429 154..155 't': T
1430 165..168 '{t}': T
1431 166..167 't': T
1432 256..257 'x': T
1433 262..263 'y': impl Trait<Type = i64>
1434 289..397 '{ ...r>); }': ()
1435 295..298 'get': fn get<T>(T) -> <T as Trait>::Type
1436 295..301 'get(x)': u32
1437 299..300 'x': T
1438 307..311 'get2': fn get2<u32, T>(T) -> u32
1439 307..314 'get2(x)': u32
1440 312..313 'x': T
1441 320..323 'get': fn get<impl Trait<Type = i64>>(impl Trait<Type = i64>) -> <impl Trait<Type = i64> as Trait>::Type
1442 320..326 'get(y)': i64
1443 324..325 'y': impl Trait<Type = i64>
1444 332..336 'get2': fn get2<i64, impl Trait<Type = i64>>(impl Trait<Type = i64>) -> i64
1445 332..339 'get2(y)': i64
1446 337..338 'y': impl Trait<Type = i64>
1447 345..348 'get': fn get<S<u64>>(S<u64>) -> <S<u64> as Trait>::Type
1448 345..356 'get(set(S))': u64
1449 349..352 'set': fn set<S<u64>>(S<u64>) -> S<u64>
1450 349..355 'set(S)': S<u64>
1451 353..354 'S': S<u64>
1452 362..366 'get2': fn get2<u64, S<u64>>(S<u64>) -> u64
1453 362..374 'get2(set(S))': u64
1454 367..370 'set': fn set<S<u64>>(S<u64>) -> S<u64>
1455 367..373 'set(S)': S<u64>
1456 371..372 'S': S<u64>
1457 380..384 'get2': fn get2<str, S<str>>(S<str>) -> str
1458 380..394 'get2(S::<str>)': str
1459 385..393 'S::<str>': S<str>
1460 "#]],
1461 );
1462}
1463
1464#[test]
1465fn impl_trait_assoc_binding_projection_bug() {
1466 check_types(
1467 r#"
1468//- /main.rs crate:main deps:std
1469pub trait Language {
1470 type Kind;
1471}
1472pub enum RustLanguage {}
1473impl Language for RustLanguage {
1474 type Kind = SyntaxKind;
1475}
1476struct SyntaxNode<L> {}
1477fn foo() -> impl Iterator<Item = SyntaxNode<RustLanguage>> {}
1478
1479trait Clone {
1480 fn clone(&self) -> Self;
1481}
1482
1483fn api_walkthrough() {
1484 for node in foo() {
1485 node.clone();
1486 } //^ {unknown}
1487}
1488
1489//- /std.rs crate:std
1490#[prelude_import] use iter::*;
1491mod iter {
1492 trait IntoIterator {
1493 type Item;
1494 }
1495 trait Iterator {
1496 type Item;
1497 }
1498 impl<T: Iterator> IntoIterator for T {
1499 type Item = <T as Iterator>::Item;
1500 }
1501}
1502"#,
1503 );
1504}
1505
1506#[test]
1507fn projection_eq_within_chalk() {
1508 check_infer(
1509 r#"
1510 trait Trait1 {
1511 type Type;
1512 }
1513 trait Trait2<T> {
1514 fn foo(self) -> T;
1515 }
1516 impl<T, U> Trait2<T> for U where U: Trait1<Type = T> {}
1517
1518 fn test<T: Trait1<Type = u32>>(x: T) {
1519 x.foo();
1520 }
1521 "#,
1522 expect![[r#"
1523 61..65 'self': Self
1524 163..164 'x': T
1525 169..185 '{ ...o(); }': ()
1526 175..176 'x': T
1527 175..182 'x.foo()': u32
1528 "#]],
1529 );
1530}
1531
1532#[test]
1533fn where_clause_trait_in_scope_for_method_resolution() {
1534 check_types(
1535 r#"
1536mod foo {
1537 trait Trait {
1538 fn foo(&self) -> u32 {}
1539 }
1540}
1541
1542fn test<T: foo::Trait>(x: T) {
1543 x.foo();
1544} //^ u32
1545"#,
1546 );
1547}
1548
1549#[test]
1550fn super_trait_method_resolution() {
1551 check_infer(
1552 r#"
1553 mod foo {
1554 trait SuperTrait {
1555 fn foo(&self) -> u32 {}
1556 }
1557 }
1558 trait Trait1: foo::SuperTrait {}
1559 trait Trait2 where Self: foo::SuperTrait {}
1560
1561 fn test<T: Trait1, U: Trait2>(x: T, y: U) {
1562 x.foo();
1563 y.foo();
1564 }
1565 "#,
1566 expect![[r#"
1567 49..53 'self': &Self
1568 62..64 '{}': ()
1569 181..182 'x': T
1570 187..188 'y': U
1571 193..222 '{ ...o(); }': ()
1572 199..200 'x': T
1573 199..206 'x.foo()': u32
1574 212..213 'y': U
1575 212..219 'y.foo()': u32
1576 "#]],
1577 );
1578}
1579
1580#[test]
1581fn super_trait_impl_trait_method_resolution() {
1582 check_infer(
1583 r#"
1584 mod foo {
1585 trait SuperTrait {
1586 fn foo(&self) -> u32 {}
1587 }
1588 }
1589 trait Trait1: foo::SuperTrait {}
1590
1591 fn test(x: &impl Trait1) {
1592 x.foo();
1593 }
1594 "#,
1595 expect![[r#"
1596 49..53 'self': &Self
1597 62..64 '{}': ()
1598 115..116 'x': &impl Trait1
1599 132..148 '{ ...o(); }': ()
1600 138..139 'x': &impl Trait1
1601 138..145 'x.foo()': u32
1602 "#]],
1603 );
1604}
1605
1606#[test]
1607fn super_trait_cycle() {
1608 // This just needs to not crash
1609 check_infer(
1610 r#"
1611 trait A: B {}
1612 trait B: A {}
1613
1614 fn test<T: A>(x: T) {
1615 x.foo();
1616 }
1617 "#,
1618 expect![[r#"
1619 43..44 'x': T
1620 49..65 '{ ...o(); }': ()
1621 55..56 'x': T
1622 55..62 'x.foo()': {unknown}
1623 "#]],
1624 );
1625}
1626
1627#[test]
1628fn super_trait_assoc_type_bounds() {
1629 check_infer(
1630 r#"
1631 trait SuperTrait { type Type; }
1632 trait Trait where Self: SuperTrait {}
1633
1634 fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
1635 fn set<T: Trait<Type = u64>>(t: T) -> T {t}
1636
1637 struct S<T>;
1638 impl<T> SuperTrait for S<T> { type Type = T; }
1639 impl<T> Trait for S<T> {}
1640
1641 fn test() {
1642 get2(set(S));
1643 }
1644 "#,
1645 expect![[r#"
1646 102..103 't': T
1647 113..115 '{}': ()
1648 145..146 't': T
1649 156..159 '{t}': T
1650 157..158 't': T
1651 258..279 '{ ...S)); }': ()
1652 264..268 'get2': fn get2<u64, S<u64>>(S<u64>) -> u64
1653 264..276 'get2(set(S))': u64
1654 269..272 'set': fn set<S<u64>>(S<u64>) -> S<u64>
1655 269..275 'set(S)': S<u64>
1656 273..274 'S': S<u64>
1657 "#]],
1658 );
1659}
1660
1661#[test]
1662fn fn_trait() {
1663 check_infer(
1664 r#"
1665 trait FnOnce<Args> {
1666 type Output;
1667
1668 fn call_once(self, args: Args) -> <Self as FnOnce<Args>>::Output;
1669 }
1670
1671 fn test<F: FnOnce(u32, u64) -> u128>(f: F) {
1672 f.call_once((1, 2));
1673 }
1674 "#,
1675 expect![[r#"
1676 56..60 'self': Self
1677 62..66 'args': Args
1678 149..150 'f': F
1679 155..183 '{ ...2)); }': ()
1680 161..162 'f': F
1681 161..180 'f.call...1, 2))': u128
1682 173..179 '(1, 2)': (u32, u64)
1683 174..175 '1': u32
1684 177..178 '2': u64
1685 "#]],
1686 );
1687}
1688
1689#[test]
1690fn fn_ptr_and_item() {
1691 check_infer(
1692 r#"
1693 #[lang="fn_once"]
1694 trait FnOnce<Args> {
1695 type Output;
1696
1697 fn call_once(self, args: Args) -> Self::Output;
1698 }
1699
1700 trait Foo<T> {
1701 fn foo(&self) -> T;
1702 }
1703
1704 struct Bar<T>(T);
1705
1706 impl<A1, R, F: FnOnce(A1) -> R> Foo<(A1, R)> for Bar<F> {
1707 fn foo(&self) -> (A1, R) {}
1708 }
1709
1710 enum Opt<T> { None, Some(T) }
1711 impl<T> Opt<T> {
1712 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Opt<U> {}
1713 }
1714
1715 fn test() {
1716 let bar: Bar<fn(u8) -> u32>;
1717 bar.foo();
1718
1719 let opt: Opt<u8>;
1720 let f: fn(u8) -> u32;
1721 opt.map(f);
1722 }
1723 "#,
1724 expect![[r#"
1725 74..78 'self': Self
1726 80..84 'args': Args
1727 139..143 'self': &Self
1728 243..247 'self': &Bar<F>
1729 260..262 '{}': ()
1730 346..350 'self': Opt<T>
1731 352..353 'f': F
1732 368..370 '{}': ()
1733 384..500 '{ ...(f); }': ()
1734 394..397 'bar': Bar<fn(u8) -> u32>
1735 423..426 'bar': Bar<fn(u8) -> u32>
1736 423..432 'bar.foo()': (u8, u32)
1737 443..446 'opt': Opt<u8>
1738 465..466 'f': fn(u8) -> u32
1739 487..490 'opt': Opt<u8>
1740 487..497 'opt.map(f)': Opt<u32>
1741 495..496 'f': fn(u8) -> u32
1742 "#]],
1743 );
1744}
1745
1746#[test]
1747fn fn_trait_deref_with_ty_default() {
1748 check_infer(
1749 r#"
1750 #[lang = "deref"]
1751 trait Deref {
1752 type Target;
1753
1754 fn deref(&self) -> &Self::Target;
1755 }
1756
1757 #[lang="fn_once"]
1758 trait FnOnce<Args> {
1759 type Output;
1760
1761 fn call_once(self, args: Args) -> Self::Output;
1762 }
1763
1764 struct Foo;
1765
1766 impl Foo {
1767 fn foo(&self) -> usize {}
1768 }
1769
1770 struct Lazy<T, F = fn() -> T>(F);
1771
1772 impl<T, F> Lazy<T, F> {
1773 pub fn new(f: F) -> Lazy<T, F> {}
1774 }
1775
1776 impl<T, F: FnOnce() -> T> Deref for Lazy<T, F> {
1777 type Target = T;
1778 }
1779
1780 fn test() {
1781 let lazy1: Lazy<Foo, _> = Lazy::new(|| Foo);
1782 let r1 = lazy1.foo();
1783
1784 fn make_foo_fn() -> Foo {}
1785 let make_foo_fn_ptr: fn() -> Foo = make_foo_fn;
1786 let lazy2: Lazy<Foo, _> = Lazy::new(make_foo_fn_ptr);
1787 let r2 = lazy2.foo();
1788 }
1789 "#,
1790 expect![[r#"
1791 64..68 'self': &Self
1792 165..169 'self': Self
1793 171..175 'args': Args
1794 239..243 'self': &Foo
1795 254..256 '{}': ()
1796 334..335 'f': F
1797 354..356 '{}': ()
1798 443..689 '{ ...o(); }': ()
1799 453..458 'lazy1': Lazy<Foo, || -> Foo>
1800 475..484 'Lazy::new': fn new<Foo, || -> Foo>(|| -> Foo) -> Lazy<Foo, || -> Foo>
1801 475..492 'Lazy::...| Foo)': Lazy<Foo, || -> Foo>
1802 485..491 '|| Foo': || -> Foo
1803 488..491 'Foo': Foo
1804 502..504 'r1': usize
1805 507..512 'lazy1': Lazy<Foo, || -> Foo>
1806 507..518 'lazy1.foo()': usize
1807 560..575 'make_foo_fn_ptr': fn() -> Foo
1808 591..602 'make_foo_fn': fn make_foo_fn() -> Foo
1809 612..617 'lazy2': Lazy<Foo, fn() -> Foo>
1810 634..643 'Lazy::new': fn new<Foo, fn() -> Foo>(fn() -> Foo) -> Lazy<Foo, fn() -> Foo>
1811 634..660 'Lazy::...n_ptr)': Lazy<Foo, fn() -> Foo>
1812 644..659 'make_foo_fn_ptr': fn() -> Foo
1813 670..672 'r2': usize
1814 675..680 'lazy2': Lazy<Foo, fn() -> Foo>
1815 675..686 'lazy2.foo()': usize
1816 549..551 '{}': ()
1817 "#]],
1818 );
1819}
1820
1821#[test]
1822fn closure_1() {
1823 check_infer(
1824 r#"
1825 #[lang = "fn_once"]
1826 trait FnOnce<Args> {
1827 type Output;
1828 }
1829
1830 enum Option<T> { Some(T), None }
1831 impl<T> Option<T> {
1832 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Option<U> {}
1833 }
1834
1835 fn test() {
1836 let x = Option::Some(1u32);
1837 x.map(|v| v + 1);
1838 x.map(|_v| 1u64);
1839 let y: Option<i64> = x.map(|_v| 1);
1840 }
1841 "#,
1842 expect![[r#"
1843 147..151 'self': Option<T>
1844 153..154 'f': F
1845 172..174 '{}': ()
1846 188..307 '{ ... 1); }': ()
1847 198..199 'x': Option<u32>
1848 202..214 'Option::Some': Some<u32>(u32) -> Option<u32>
1849 202..220 'Option...(1u32)': Option<u32>
1850 215..219 '1u32': u32
1851 226..227 'x': Option<u32>
1852 226..242 'x.map(...v + 1)': Option<u32>
1853 232..241 '|v| v + 1': |u32| -> u32
1854 233..234 'v': u32
1855 236..237 'v': u32
1856 236..241 'v + 1': u32
1857 240..241 '1': u32
1858 248..249 'x': Option<u32>
1859 248..264 'x.map(... 1u64)': Option<u64>
1860 254..263 '|_v| 1u64': |u32| -> u64
1861 255..257 '_v': u32
1862 259..263 '1u64': u64
1863 274..275 'y': Option<i64>
1864 291..292 'x': Option<u32>
1865 291..304 'x.map(|_v| 1)': Option<i64>
1866 297..303 '|_v| 1': |u32| -> i64
1867 298..300 '_v': u32
1868 302..303 '1': i64
1869 "#]],
1870 );
1871}
1872
1873#[test]
1874fn closure_2() {
1875 check_infer(
1876 r#"
1877 trait FnOnce<Args> {
1878 type Output;
1879 }
1880
1881 fn test<F: FnOnce(u32) -> u64>(f: F) {
1882 f(1);
1883 let g = |v| v + 1;
1884 g(1u64);
1885 let h = |v| 1u128 + v;
1886 }
1887 "#,
1888 expect![[r#"
1889 72..73 'f': F
1890 78..154 '{ ...+ v; }': ()
1891 84..85 'f': F
1892 84..88 'f(1)': {unknown}
1893 86..87 '1': i32
1894 98..99 'g': |u64| -> i32
1895 102..111 '|v| v + 1': |u64| -> i32
1896 103..104 'v': u64
1897 106..107 'v': u64
1898 106..111 'v + 1': i32
1899 110..111 '1': i32
1900 117..118 'g': |u64| -> i32
1901 117..124 'g(1u64)': i32
1902 119..123 '1u64': u64
1903 134..135 'h': |u128| -> u128
1904 138..151 '|v| 1u128 + v': |u128| -> u128
1905 139..140 'v': u128
1906 142..147 '1u128': u128
1907 142..151 '1u128 + v': u128
1908 150..151 'v': u128
1909 "#]],
1910 );
1911}
1912
1913#[test]
1914fn closure_as_argument_inference_order() {
1915 check_infer(
1916 r#"
1917 #[lang = "fn_once"]
1918 trait FnOnce<Args> {
1919 type Output;
1920 }
1921
1922 fn foo1<T, U, F: FnOnce(T) -> U>(x: T, f: F) -> U {}
1923 fn foo2<T, U, F: FnOnce(T) -> U>(f: F, x: T) -> U {}
1924
1925 struct S;
1926 impl S {
1927 fn method(self) -> u64;
1928
1929 fn foo1<T, U, F: FnOnce(T) -> U>(self, x: T, f: F) -> U {}
1930 fn foo2<T, U, F: FnOnce(T) -> U>(self, f: F, x: T) -> U {}
1931 }
1932
1933 fn test() {
1934 let x1 = foo1(S, |s| s.method());
1935 let x2 = foo2(|s| s.method(), S);
1936 let x3 = S.foo1(S, |s| s.method());
1937 let x4 = S.foo2(|s| s.method(), S);
1938 }
1939 "#,
1940 expect![[r#"
1941 94..95 'x': T
1942 100..101 'f': F
1943 111..113 '{}': ()
1944 147..148 'f': F
1945 153..154 'x': T
1946 164..166 '{}': ()
1947 201..205 'self': S
1948 253..257 'self': S
1949 259..260 'x': T
1950 265..266 'f': F
1951 276..278 '{}': ()
1952 316..320 'self': S
1953 322..323 'f': F
1954 328..329 'x': T
1955 339..341 '{}': ()
1956 355..514 '{ ... S); }': ()
1957 365..367 'x1': u64
1958 370..374 'foo1': fn foo1<S, u64, |S| -> u64>(S, |S| -> u64) -> u64
1959 370..393 'foo1(S...hod())': u64
1960 375..376 'S': S
1961 378..392 '|s| s.method()': |S| -> u64
1962 379..380 's': S
1963 382..383 's': S
1964 382..392 's.method()': u64
1965 403..405 'x2': u64
1966 408..412 'foo2': fn foo2<S, u64, |S| -> u64>(|S| -> u64, S) -> u64
1967 408..431 'foo2(|...(), S)': u64
1968 413..427 '|s| s.method()': |S| -> u64
1969 414..415 's': S
1970 417..418 's': S
1971 417..427 's.method()': u64
1972 429..430 'S': S
1973 441..443 'x3': u64
1974 446..447 'S': S
1975 446..471 'S.foo1...hod())': u64
1976 453..454 'S': S
1977 456..470 '|s| s.method()': |S| -> u64
1978 457..458 's': S
1979 460..461 's': S
1980 460..470 's.method()': u64
1981 481..483 'x4': u64
1982 486..487 'S': S
1983 486..511 'S.foo2...(), S)': u64
1984 493..507 '|s| s.method()': |S| -> u64
1985 494..495 's': S
1986 497..498 's': S
1987 497..507 's.method()': u64
1988 509..510 'S': S
1989 "#]],
1990 );
1991}
1992
1993#[test]
1994fn fn_item_fn_trait() {
1995 check_types(
1996 r#"
1997#[lang = "fn_once"]
1998trait FnOnce<Args> {
1999 type Output;
2000}
2001
2002struct S;
2003
2004fn foo() -> S {}
2005
2006fn takes_closure<U, F: FnOnce() -> U>(f: F) -> U { f() }
2007
2008fn test() {
2009 takes_closure(foo);
2010} //^^^^^^^^^^^^^^^^^^ S
2011"#,
2012 );
2013}
2014
2015#[test]
2016fn unselected_projection_in_trait_env_1() {
2017 check_types(
2018 r#"
2019//- /main.rs
2020trait Trait {
2021 type Item;
2022}
2023
2024trait Trait2 {
2025 fn foo(&self) -> u32;
2026}
2027
2028fn test<T: Trait>() where T::Item: Trait2 {
2029 let x: T::Item = no_matter;
2030 x.foo();
2031} //^ u32
2032"#,
2033 );
2034}
2035
2036#[test]
2037fn unselected_projection_in_trait_env_2() {
2038 check_types(
2039 r#"
2040trait Trait<T> {
2041 type Item;
2042}
2043
2044trait Trait2 {
2045 fn foo(&self) -> u32;
2046}
2047
2048fn test<T, U>() where T::Item: Trait2, T: Trait<U::Item>, U: Trait<()> {
2049 let x: T::Item = no_matter;
2050 x.foo();
2051} //^ u32
2052"#,
2053 );
2054}
2055
2056#[test]
2057fn unselected_projection_on_impl_self() {
2058 check_infer(
2059 r#"
2060 //- /main.rs
2061 trait Trait {
2062 type Item;
2063
2064 fn f(&self, x: Self::Item);
2065 }
2066
2067 struct S;
2068
2069 impl Trait for S {
2070 type Item = u32;
2071 fn f(&self, x: Self::Item) { let y = x; }
2072 }
2073
2074 struct S2;
2075
2076 impl Trait for S2 {
2077 type Item = i32;
2078 fn f(&self, x: <Self>::Item) { let y = x; }
2079 }
2080 "#,
2081 expect![[r#"
2082 40..44 'self': &Self
2083 46..47 'x': Trait::Item<Self>
2084 126..130 'self': &S
2085 132..133 'x': u32
2086 147..161 '{ let y = x; }': ()
2087 153..154 'y': u32
2088 157..158 'x': u32
2089 228..232 'self': &S2
2090 234..235 'x': i32
2091 251..265 '{ let y = x; }': ()
2092 257..258 'y': i32
2093 261..262 'x': i32
2094 "#]],
2095 );
2096}
2097
2098#[test]
2099fn unselected_projection_on_trait_self() {
2100 check_types(
2101 r#"
2102trait Trait {
2103 type Item;
2104
2105 fn f(&self) -> Self::Item { loop {} }
2106}
2107
2108struct S;
2109impl Trait for S {
2110 type Item = u32;
2111}
2112
2113fn test() {
2114 S.f();
2115} //^ u32
2116"#,
2117 );
2118}
2119
2120#[test]
2121fn unselected_projection_chalk_fold() {
2122 check_types(
2123 r#"
2124trait Interner {}
2125trait Fold<I: Interner, TI = I> {
2126 type Result;
2127}
2128
2129struct Ty<I: Interner> {}
2130impl<I: Interner, TI: Interner> Fold<I, TI> for Ty<I> {
2131 type Result = Ty<TI>;
2132}
2133
2134fn fold<I: Interner, T>(interner: &I, t: T) -> T::Result
2135where
2136 T: Fold<I, I>,
2137{
2138 loop {}
2139}
2140
2141fn foo<I: Interner>(interner: &I, t: Ty<I>) {
2142 fold(interner, t);
2143} //^ Ty<I>
2144"#,
2145 );
2146}
2147
2148#[test]
2149fn trait_impl_self_ty() {
2150 check_types(
2151 r#"
2152trait Trait<T> {
2153 fn foo(&self);
2154}
2155
2156struct S;
2157
2158impl Trait<Self> for S {}
2159
2160fn test() {
2161 S.foo();
2162} //^ ()
2163"#,
2164 );
2165}
2166
2167#[test]
2168fn trait_impl_self_ty_cycle() {
2169 check_types(
2170 r#"
2171trait Trait {
2172 fn foo(&self);
2173}
2174
2175struct S<T>;
2176
2177impl Trait for S<Self> {}
2178
2179fn test() {
2180 S.foo();
2181} //^ {unknown}
2182"#,
2183 );
2184}
2185
2186#[test]
2187fn unselected_projection_in_trait_env_cycle_1() {
2188 // this is a legitimate cycle
2189 check_types(
2190 r#"
2191trait Trait {
2192 type Item;
2193}
2194
2195trait Trait2<T> {}
2196
2197fn test<T: Trait>() where T: Trait2<T::Item> {
2198 let x: T::Item = no_matter;
2199} //^ {unknown}
2200"#,
2201 );
2202}
2203
2204#[test]
2205fn unselected_projection_in_trait_env_cycle_2() {
2206 // this is a legitimate cycle
2207 check_types(
2208 r#"
2209//- /main.rs
2210trait Trait<T> {
2211 type Item;
2212}
2213
2214fn test<T, U>() where T: Trait<U::Item>, U: Trait<T::Item> {
2215 let x: T::Item = no_matter;
2216} //^ {unknown}
2217"#,
2218 );
2219}
2220
2221#[test]
2222fn inline_assoc_type_bounds_1() {
2223 check_types(
2224 r#"
2225trait Iterator {
2226 type Item;
2227}
2228trait OtherTrait<T> {
2229 fn foo(&self) -> T;
2230}
2231
2232// workaround for Chalk assoc type normalization problems
2233pub struct S<T>;
2234impl<T: Iterator> Iterator for S<T> {
2235 type Item = <T as Iterator>::Item;
2236}
2237
2238fn test<I: Iterator<Item: OtherTrait<u32>>>() {
2239 let x: <S<I> as Iterator>::Item;
2240 x.foo();
2241} //^ u32
2242"#,
2243 );
2244}
2245
2246#[test]
2247fn inline_assoc_type_bounds_2() {
2248 check_types(
2249 r#"
2250trait Iterator {
2251 type Item;
2252}
2253
2254fn test<I: Iterator<Item: Iterator<Item = u32>>>() {
2255 let x: <<I as Iterator>::Item as Iterator>::Item;
2256 x;
2257} //^ u32
2258"#,
2259 );
2260}
2261
2262#[test]
2263fn proc_macro_server_types() {
2264 check_infer(
2265 r#"
2266 macro_rules! with_api {
2267 ($S:ident, $self:ident, $m:ident) => {
2268 $m! {
2269 TokenStream {
2270 fn new() -> $S::TokenStream;
2271 },
2272 Group {
2273 },
2274 }
2275 };
2276 }
2277 macro_rules! associated_item {
2278 (type TokenStream) =>
2279 (type TokenStream: 'static;);
2280 (type Group) =>
2281 (type Group: 'static;);
2282 ($($item:tt)*) => ($($item)*;)
2283 }
2284 macro_rules! declare_server_traits {
2285 ($($name:ident {
2286 $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
2287 }),* $(,)?) => {
2288 pub trait Types {
2289 $(associated_item!(type $name);)*
2290 }
2291
2292 $(pub trait $name: Types {
2293 $(associated_item!(fn $method($($arg: $arg_ty),*) $(-> $ret_ty)?);)*
2294 })*
2295
2296 pub trait Server: Types $(+ $name)* {}
2297 impl<S: Types $(+ $name)*> Server for S {}
2298 }
2299 }
2300
2301 with_api!(Self, self_, declare_server_traits);
2302 struct G {}
2303 struct T {}
2304 struct Rustc;
2305 impl Types for Rustc {
2306 type TokenStream = T;
2307 type Group = G;
2308 }
2309
2310 fn make<T>() -> T { loop {} }
2311 impl TokenStream for Rustc {
2312 fn new() -> Self::TokenStream {
2313 let group: Self::Group = make();
2314 make()
2315 }
2316 }
2317 "#,
2318 expect![[r#"
2319 1061..1072 '{ loop {} }': T
2320 1063..1070 'loop {}': !
2321 1068..1070 '{}': ()
2322 1136..1199 '{ ... }': T
2323 1150..1155 'group': G
2324 1171..1175 'make': fn make<G>() -> G
2325 1171..1177 'make()': G
2326 1187..1191 'make': fn make<T>() -> T
2327 1187..1193 'make()': T
2328 "#]],
2329 );
2330}
2331
2332#[test]
2333fn unify_impl_trait() {
2334 check_infer_with_mismatches(
2335 r#"
2336 trait Trait<T> {}
2337
2338 fn foo(x: impl Trait<u32>) { loop {} }
2339 fn bar<T>(x: impl Trait<T>) -> T { loop {} }
2340
2341 struct S<T>(T);
2342 impl<T> Trait<T> for S<T> {}
2343
2344 fn default<T>() -> T { loop {} }
2345
2346 fn test() -> impl Trait<i32> {
2347 let s1 = S(default());
2348 foo(s1);
2349 let x: i32 = bar(S(default()));
2350 S(default())
2351 }
2352 "#,
2353 expect![[r#"
2354 26..27 'x': impl Trait<u32>
2355 46..57 '{ loop {} }': ()
2356 48..55 'loop {}': !
2357 53..55 '{}': ()
2358 68..69 'x': impl Trait<T>
2359 91..102 '{ loop {} }': T
2360 93..100 'loop {}': !
2361 98..100 '{}': ()
2362 171..182 '{ loop {} }': T
2363 173..180 'loop {}': !
2364 178..180 '{}': ()
2365 213..309 '{ ...t()) }': S<{unknown}>
2366 223..225 's1': S<u32>
2367 228..229 'S': S<u32>(u32) -> S<u32>
2368 228..240 'S(default())': S<u32>
2369 230..237 'default': fn default<u32>() -> u32
2370 230..239 'default()': u32
2371 246..249 'foo': fn foo(S<u32>)
2372 246..253 'foo(s1)': ()
2373 250..252 's1': S<u32>
2374 263..264 'x': i32
2375 272..275 'bar': fn bar<i32>(S<i32>) -> i32
2376 272..289 'bar(S(...lt()))': i32
2377 276..277 'S': S<i32>(i32) -> S<i32>
2378 276..288 'S(default())': S<i32>
2379 278..285 'default': fn default<i32>() -> i32
2380 278..287 'default()': i32
2381 295..296 'S': S<{unknown}>({unknown}) -> S<{unknown}>
2382 295..307 'S(default())': S<{unknown}>
2383 297..304 'default': fn default<{unknown}>() -> {unknown}
2384 297..306 'default()': {unknown}
2385 "#]],
2386 );
2387}
2388
2389#[test]
2390fn assoc_types_from_bounds() {
2391 check_infer(
2392 r#"
2393 //- /main.rs
2394 #[lang = "fn_once"]
2395 trait FnOnce<Args> {
2396 type Output;
2397 }
2398
2399 trait T {
2400 type O;
2401 }
2402
2403 impl T for () {
2404 type O = ();
2405 }
2406
2407 fn f<X, F>(_v: F)
2408 where
2409 X: T,
2410 F: FnOnce(&X::O),
2411 { }
2412
2413 fn main() {
2414 f::<(), _>(|z| { z; });
2415 }
2416 "#,
2417 expect![[r#"
2418 133..135 '_v': F
2419 178..181 '{ }': ()
2420 193..224 '{ ... }); }': ()
2421 199..209 'f::<(), _>': fn f<(), |&()| -> ()>(|&()| -> ())
2422 199..221 'f::<()... z; })': ()
2423 210..220 '|z| { z; }': |&()| -> ()
2424 211..212 'z': &()
2425 214..220 '{ z; }': ()
2426 216..217 'z': &()
2427 "#]],
2428 );
2429}
2430
2431#[test]
2432fn associated_type_bound() {
2433 check_types(
2434 r#"
2435pub trait Trait {
2436 type Item: OtherTrait<u32>;
2437}
2438pub trait OtherTrait<T> {
2439 fn foo(&self) -> T;
2440}
2441
2442// this is just a workaround for chalk#234
2443pub struct S<T>;
2444impl<T: Trait> Trait for S<T> {
2445 type Item = <T as Trait>::Item;
2446}
2447
2448fn test<T: Trait>() {
2449 let y: <S<T> as Trait>::Item = no_matter;
2450 y.foo();
2451} //^ u32
2452"#,
2453 );
2454}
2455
2456#[test]
2457fn dyn_trait_through_chalk() {
2458 check_types(
2459 r#"
2460struct Box<T> {}
2461#[lang = "deref"]
2462trait Deref {
2463 type Target;
2464}
2465impl<T> Deref for Box<T> {
2466 type Target = T;
2467}
2468trait Trait {
2469 fn foo(&self);
2470}
2471
2472fn test(x: Box<dyn Trait>) {
2473 x.foo();
2474} //^ ()
2475"#,
2476 );
2477}
2478
2479#[test]
2480fn string_to_owned() {
2481 check_types(
2482 r#"
2483struct String {}
2484pub trait ToOwned {
2485 type Owned;
2486 fn to_owned(&self) -> Self::Owned;
2487}
2488impl ToOwned for str {
2489 type Owned = String;
2490}
2491fn test() {
2492 "foo".to_owned();
2493} //^ String
2494"#,
2495 );
2496}
2497
2498#[test]
2499fn iterator_chain() {
2500 check_infer(
2501 r#"
2502 //- /main.rs
2503 #[lang = "fn_once"]
2504 trait FnOnce<Args> {
2505 type Output;
2506 }
2507 #[lang = "fn_mut"]
2508 trait FnMut<Args>: FnOnce<Args> { }
2509
2510 enum Option<T> { Some(T), None }
2511 use Option::*;
2512
2513 pub trait Iterator {
2514 type Item;
2515
2516 fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
2517 where
2518 F: FnMut(Self::Item) -> Option<B>,
2519 { loop {} }
2520
2521 fn for_each<F>(self, f: F)
2522 where
2523 F: FnMut(Self::Item),
2524 { loop {} }
2525 }
2526
2527 pub trait IntoIterator {
2528 type Item;
2529 type IntoIter: Iterator<Item = Self::Item>;
2530 fn into_iter(self) -> Self::IntoIter;
2531 }
2532
2533 pub struct FilterMap<I, F> { }
2534 impl<B, I: Iterator, F> Iterator for FilterMap<I, F>
2535 where
2536 F: FnMut(I::Item) -> Option<B>,
2537 {
2538 type Item = B;
2539 }
2540
2541 #[stable(feature = "rust1", since = "1.0.0")]
2542 impl<I: Iterator> IntoIterator for I {
2543 type Item = I::Item;
2544 type IntoIter = I;
2545
2546 fn into_iter(self) -> I {
2547 self
2548 }
2549 }
2550
2551 struct Vec<T> {}
2552 impl<T> Vec<T> {
2553 fn new() -> Self { loop {} }
2554 }
2555
2556 impl<T> IntoIterator for Vec<T> {
2557 type Item = T;
2558 type IntoIter = IntoIter<T>;
2559 }
2560
2561 pub struct IntoIter<T> { }
2562 impl<T> Iterator for IntoIter<T> {
2563 type Item = T;
2564 }
2565
2566 fn main() {
2567 Vec::<i32>::new().into_iter()
2568 .filter_map(|x| if x > 0 { Some(x as u32) } else { None })
2569 .for_each(|y| { y; });
2570 }
2571 "#,
2572 expect![[r#"
2573 226..230 'self': Self
2574 232..233 'f': F
2575 317..328 '{ loop {} }': FilterMap<Self, F>
2576 319..326 'loop {}': !
2577 324..326 '{}': ()
2578 349..353 'self': Self
2579 355..356 'f': F
2580 405..416 '{ loop {} }': ()
2581 407..414 'loop {}': !
2582 412..414 '{}': ()
2583 525..529 'self': Self
2584 854..858 'self': I
2585 865..885 '{ ... }': I
2586 875..879 'self': I
2587 944..955 '{ loop {} }': Vec<T>
2588 946..953 'loop {}': !
2589 951..953 '{}': ()
2590 1142..1269 '{ ... }); }': ()
2591 1148..1163 'Vec::<i32>::new': fn new<i32>() -> Vec<i32>
2592 1148..1165 'Vec::<...:new()': Vec<i32>
2593 1148..1177 'Vec::<...iter()': IntoIter<i32>
2594 1148..1240 'Vec::<...one })': FilterMap<IntoIter<i32>, |i32| -> Option<u32>>
2595 1148..1266 'Vec::<... y; })': ()
2596 1194..1239 '|x| if...None }': |i32| -> Option<u32>
2597 1195..1196 'x': i32
2598 1198..1239 'if x >...None }': Option<u32>
2599 1201..1202 'x': i32
2600 1201..1206 'x > 0': bool
2601 1205..1206 '0': i32
2602 1207..1225 '{ Some...u32) }': Option<u32>
2603 1209..1213 'Some': Some<u32>(u32) -> Option<u32>
2604 1209..1223 'Some(x as u32)': Option<u32>
2605 1214..1215 'x': i32
2606 1214..1222 'x as u32': u32
2607 1231..1239 '{ None }': Option<u32>
2608 1233..1237 'None': Option<u32>
2609 1255..1265 '|y| { y; }': |u32| -> ()
2610 1256..1257 'y': u32
2611 1259..1265 '{ y; }': ()
2612 1261..1262 'y': u32
2613 "#]],
2614 );
2615}
2616
2617#[test]
2618fn nested_assoc() {
2619 check_types(
2620 r#"
2621struct Bar;
2622struct Foo;
2623
2624trait A {
2625 type OutputA;
2626}
2627
2628impl A for Bar {
2629 type OutputA = Foo;
2630}
2631
2632trait B {
2633 type Output;
2634 fn foo() -> Self::Output;
2635}
2636
2637impl<T:A> B for T {
2638 type Output = T::OutputA;
2639 fn foo() -> Self::Output { loop {} }
2640}
2641
2642fn main() {
2643 Bar::foo();
2644} //^ Foo
2645"#,
2646 );
2647}
2648
2649#[test]
2650fn trait_object_no_coercion() {
2651 check_infer_with_mismatches(
2652 r#"
2653 trait Foo {}
2654
2655 fn foo(x: &dyn Foo) {}
2656
2657 fn test(x: &dyn Foo) {
2658 foo(x);
2659 }
2660 "#,
2661 expect![[r#"
2662 21..22 'x': &dyn Foo
2663 34..36 '{}': ()
2664 46..47 'x': &dyn Foo
2665 59..74 '{ foo(x); }': ()
2666 65..68 'foo': fn foo(&dyn Foo)
2667 65..71 'foo(x)': ()
2668 69..70 'x': &dyn Foo
2669 "#]],
2670 );
2671}
2672
2673#[test]
2674fn builtin_copy() {
2675 check_infer_with_mismatches(
2676 r#"
2677 #[lang = "copy"]
2678 trait Copy {}
2679
2680 struct IsCopy;
2681 impl Copy for IsCopy {}
2682 struct NotCopy;
2683
2684 trait Test { fn test(&self) -> bool; }
2685 impl<T: Copy> Test for T {}
2686
2687 fn test() {
2688 IsCopy.test();
2689 NotCopy.test();
2690 (IsCopy, IsCopy).test();
2691 (IsCopy, NotCopy).test();
2692 }
2693 "#,
2694 expect![[r#"
2695 110..114 'self': &Self
2696 166..267 '{ ...t(); }': ()
2697 172..178 'IsCopy': IsCopy
2698 172..185 'IsCopy.test()': bool
2699 191..198 'NotCopy': NotCopy
2700 191..205 'NotCopy.test()': {unknown}
2701 211..227 '(IsCop...sCopy)': (IsCopy, IsCopy)
2702 211..234 '(IsCop...test()': bool
2703 212..218 'IsCopy': IsCopy
2704 220..226 'IsCopy': IsCopy
2705 240..257 '(IsCop...tCopy)': (IsCopy, NotCopy)
2706 240..264 '(IsCop...test()': {unknown}
2707 241..247 'IsCopy': IsCopy
2708 249..256 'NotCopy': NotCopy
2709 "#]],
2710 );
2711}
2712
2713#[test]
2714fn builtin_fn_def_copy() {
2715 check_infer_with_mismatches(
2716 r#"
2717 #[lang = "copy"]
2718 trait Copy {}
2719
2720 fn foo() {}
2721 fn bar<T: Copy>(T) -> T {}
2722 struct Struct(usize);
2723 enum Enum { Variant(usize) }
2724
2725 trait Test { fn test(&self) -> bool; }
2726 impl<T: Copy> Test for T {}
2727
2728 fn test() {
2729 foo.test();
2730 bar.test();
2731 Struct.test();
2732 Enum::Variant.test();
2733 }
2734 "#,
2735 expect![[r#"
2736 41..43 '{}': ()
2737 60..61 'T': {unknown}
2738 68..70 '{}': ()
2739 68..70: expected T, got ()
2740 145..149 'self': &Self
2741 201..281 '{ ...t(); }': ()
2742 207..210 'foo': fn foo()
2743 207..217 'foo.test()': bool
2744 223..226 'bar': fn bar<{unknown}>({unknown}) -> {unknown}
2745 223..233 'bar.test()': bool
2746 239..245 'Struct': Struct(usize) -> Struct
2747 239..252 'Struct.test()': bool
2748 258..271 'Enum::Variant': Variant(usize) -> Enum
2749 258..278 'Enum::...test()': bool
2750 "#]],
2751 );
2752}
2753
2754#[test]
2755fn builtin_fn_ptr_copy() {
2756 check_infer_with_mismatches(
2757 r#"
2758 #[lang = "copy"]
2759 trait Copy {}
2760
2761 trait Test { fn test(&self) -> bool; }
2762 impl<T: Copy> Test for T {}
2763
2764 fn test(f1: fn(), f2: fn(usize) -> u8, f3: fn(u8, u8) -> &u8) {
2765 f1.test();
2766 f2.test();
2767 f3.test();
2768 }
2769 "#,
2770 expect![[r#"
2771 54..58 'self': &Self
2772 108..110 'f1': fn()
2773 118..120 'f2': fn(usize) -> u8
2774 139..141 'f3': fn(u8, u8) -> &u8
2775 162..210 '{ ...t(); }': ()
2776 168..170 'f1': fn()
2777 168..177 'f1.test()': bool
2778 183..185 'f2': fn(usize) -> u8
2779 183..192 'f2.test()': bool
2780 198..200 'f3': fn(u8, u8) -> &u8
2781 198..207 'f3.test()': bool
2782 "#]],
2783 );
2784}
2785
2786#[test]
2787fn builtin_sized() {
2788 check_infer_with_mismatches(
2789 r#"
2790 #[lang = "sized"]
2791 trait Sized {}
2792
2793 trait Test { fn test(&self) -> bool; }
2794 impl<T: Sized> Test for T {}
2795
2796 fn test() {
2797 1u8.test();
2798 (*"foo").test(); // not Sized
2799 (1u8, 1u8).test();
2800 (1u8, *"foo").test(); // not Sized
2801 }
2802 "#,
2803 expect![[r#"
2804 56..60 'self': &Self
2805 113..228 '{ ...ized }': ()
2806 119..122 '1u8': u8
2807 119..129 '1u8.test()': bool
2808 135..150 '(*"foo").test()': {unknown}
2809 136..142 '*"foo"': str
2810 137..142 '"foo"': &str
2811 169..179 '(1u8, 1u8)': (u8, u8)
2812 169..186 '(1u8, ...test()': bool
2813 170..173 '1u8': u8
2814 175..178 '1u8': u8
2815 192..205 '(1u8, *"foo")': (u8, str)
2816 192..212 '(1u8, ...test()': {unknown}
2817 193..196 '1u8': u8
2818 198..204 '*"foo"': str
2819 199..204 '"foo"': &str
2820 "#]],
2821 );
2822}
2823
2824#[test]
2825fn integer_range_iterate() {
2826 check_types(
2827 r#"
2828//- /main.rs crate:main deps:core
2829fn test() {
2830 for x in 0..100 { x; }
2831} //^ i32
2832
2833//- /core.rs crate:core
2834pub mod ops {
2835 pub struct Range<Idx> {
2836 pub start: Idx,
2837 pub end: Idx,
2838 }
2839}
2840
2841pub mod iter {
2842 pub trait Iterator {
2843 type Item;
2844 }
2845
2846 pub trait IntoIterator {
2847 type Item;
2848 type IntoIter: Iterator<Item = Self::Item>;
2849 }
2850
2851 impl<T> IntoIterator for T where T: Iterator {
2852 type Item = <T as Iterator>::Item;
2853 type IntoIter = Self;
2854 }
2855}
2856
2857trait Step {}
2858impl Step for i32 {}
2859impl Step for i64 {}
2860
2861impl<A: Step> iter::Iterator for ops::Range<A> {
2862 type Item = A;
2863}
2864"#,
2865 );
2866}
2867
2868#[test]
2869fn infer_closure_arg() {
2870 check_infer(
2871 r#"
2872 //- /lib.rs
2873
2874 enum Option<T> {
2875 None,
2876 Some(T)
2877 }
2878
2879 fn foo() {
2880 let s = Option::None;
2881 let f = |x: Option<i32>| {};
2882 (&f)(s)
2883 }
2884 "#,
2885 expect![[r#"
2886 52..126 '{ ...)(s) }': ()
2887 62..63 's': Option<i32>
2888 66..78 'Option::None': Option<i32>
2889 88..89 'f': |Option<i32>| -> ()
2890 92..111 '|x: Op...2>| {}': |Option<i32>| -> ()
2891 93..94 'x': Option<i32>
2892 109..111 '{}': ()
2893 117..124 '(&f)(s)': ()
2894 118..120 '&f': &|Option<i32>| -> ()
2895 119..120 'f': |Option<i32>| -> ()
2896 122..123 's': Option<i32>
2897 "#]],
2898 );
2899}
2900
2901#[test]
2902fn infer_fn_trait_arg() {
2903 check_infer(
2904 r#"
2905 //- /lib.rs deps:std
2906
2907 #[lang = "fn_once"]
2908 pub trait FnOnce<Args> {
2909 type Output;
2910
2911 extern "rust-call" fn call_once(&self, args: Args) -> Self::Output;
2912 }
2913
2914 #[lang = "fn"]
2915 pub trait Fn<Args>:FnOnce<Args> {
2916 extern "rust-call" fn call(&self, args: Args) -> Self::Output;
2917 }
2918
2919 enum Option<T> {
2920 None,
2921 Some(T)
2922 }
2923
2924 fn foo<F, T>(f: F) -> T
2925 where
2926 F: Fn(Option<i32>) -> T,
2927 {
2928 let s = None;
2929 f(s)
2930 }
2931 "#,
2932 expect![[r#"
2933 101..105 'self': &Self
2934 107..111 'args': Args
2935 220..224 'self': &Self
2936 226..230 'args': Args
2937 313..314 'f': F
2938 359..389 '{ ...f(s) }': T
2939 369..370 's': Option<i32>
2940 373..377 'None': Option<i32>
2941 383..384 'f': F
2942 383..387 'f(s)': T
2943 385..386 's': Option<i32>
2944 "#]],
2945 );
2946}
2947
2948#[test]
2949fn infer_box_fn_arg() {
2950 check_infer(
2951 r#"
2952 //- /lib.rs deps:std
2953
2954 #[lang = "fn_once"]
2955 pub trait FnOnce<Args> {
2956 type Output;
2957
2958 extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
2959 }
2960
2961 #[lang = "deref"]
2962 pub trait Deref {
2963 type Target: ?Sized;
2964
2965 fn deref(&self) -> &Self::Target;
2966 }
2967
2968 #[lang = "owned_box"]
2969 pub struct Box<T: ?Sized> {
2970 inner: *mut T,
2971 }
2972
2973 impl<T: ?Sized> Deref for Box<T> {
2974 type Target = T;
2975
2976 fn deref(&self) -> &T {
2977 &self.inner
2978 }
2979 }
2980
2981 enum Option<T> {
2982 None,
2983 Some(T)
2984 }
2985
2986 fn foo() {
2987 let s = Option::None;
2988 let f: Box<dyn FnOnce(&Option<i32>)> = box (|ps| {});
2989 f(&s)
2990 }
2991 "#,
2992 expect![[r#"
2993 100..104 'self': Self
2994 106..110 'args': Args
2995 214..218 'self': &Self
2996 384..388 'self': &Box<T>
2997 396..423 '{ ... }': &T
2998 406..417 '&self.inner': &*mut T
2999 407..411 'self': &Box<T>
3000 407..417 'self.inner': *mut T
3001 478..575 '{ ...(&s) }': FnOnce::Output<dyn FnOnce<(&Option<i32>,)>, (&Option<i32>,)>
3002 488..489 's': Option<i32>
3003 492..504 'Option::None': Option<i32>
3004 514..515 'f': Box<dyn FnOnce<(&Option<i32>,)>>
3005 549..562 'box (|ps| {})': Box<|{unknown}| -> ()>
3006 554..561 '|ps| {}': |{unknown}| -> ()
3007 555..557 'ps': {unknown}
3008 559..561 '{}': ()
3009 568..569 'f': Box<dyn FnOnce<(&Option<i32>,)>>
3010 568..573 'f(&s)': FnOnce::Output<dyn FnOnce<(&Option<i32>,)>, (&Option<i32>,)>
3011 570..572 '&s': &Option<i32>
3012 571..572 's': Option<i32>
3013 "#]],
3014 );
3015}
3016
3017#[test]
3018fn infer_dyn_fn_output() {
3019 check_types(
3020 r#"
3021#[lang = "fn_once"]
3022pub trait FnOnce<Args> {
3023 type Output;
3024 extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
3025}
3026
3027#[lang = "fn"]
3028pub trait Fn<Args>: FnOnce<Args> {
3029 extern "rust-call" fn call(&self, args: Args) -> Self::Output;
3030}
3031
3032fn foo() {
3033 let f: &dyn Fn() -> i32;
3034 f();
3035 //^^^ i32
3036}"#,
3037 );
3038}
3039
3040#[test]
3041fn infer_dyn_fn_once_output() {
3042 check_types(
3043 r#"
3044#[lang = "fn_once"]
3045pub trait FnOnce<Args> {
3046 type Output;
3047 extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
3048}
3049
3050fn foo() {
3051 let f: dyn FnOnce() -> i32;
3052 f();
3053 //^^^ i32
3054}"#,
3055 );
3056}
3057
3058#[test]
3059fn variable_kinds_1() {
3060 check_types(
3061 r#"
3062trait Trait<T> { fn get(self, t: T) -> T; }
3063struct S;
3064impl Trait<u128> for S {}
3065impl Trait<f32> for S {}
3066fn test() {
3067 S.get(1);
3068 //^^^^^^^^ u128
3069 S.get(1.);
3070 //^^^^^^^^ f32
3071}
3072 "#,
3073 );
3074}
3075
3076#[test]
3077fn variable_kinds_2() {
3078 check_types(
3079 r#"
3080trait Trait { fn get(self) -> Self; }
3081impl Trait for u128 {}
3082impl Trait for f32 {}
3083fn test() {
3084 1.get();
3085 //^^^^^^^ u128
3086 (1.).get();
3087 //^^^^^^^^^^ f32
3088}
3089 "#,
3090 );
3091}
3092
3093#[test]
3094fn underscore_import() {
3095 check_types(
3096 r#"
3097mod tr {
3098 pub trait Tr {
3099 fn method(&self) -> u8 { 0 }
3100 }
3101}
3102
3103struct Tr;
3104impl crate::tr::Tr for Tr {}
3105
3106use crate::tr::Tr as _;
3107fn test() {
3108 Tr.method();
3109 //^^^^^^^^^^^ u8
3110}
3111 "#,
3112 );
3113}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 18:33:55 +0000