aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir/src/ty/tests
diff options
context:
space:
mode:
authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2019-09-26 09:19:18 +0100
committerGitHub <[email protected]>2019-09-26 09:19:18 +0100
commit79376abb43e3e1e607b5307e85dd43251ad6c5e3 (patch)
tree03ab755672e9b973bbcbb9fd86f9d2fdf4f0e1ba /crates/ra_hir/src/ty/tests
parent6c1878009db50b81fd70b7eb93a76d57a366c7ba (diff)
parent29e56b8ee480828b81011cfa16c055fa0c9c89fe (diff)
Merge #1823
1823: Support type coercion r=flodiebold a=uHOOCCOOHu Co-authored-by: uHOOCCOOHu <[email protected]>
Diffstat (limited to 'crates/ra_hir/src/ty/tests')
-rw-r--r--crates/ra_hir/src/ty/tests/coercion.rs369
-rw-r--r--crates/ra_hir/src/ty/tests/never_type.rs246
2 files changed, 615 insertions, 0 deletions
diff --git a/crates/ra_hir/src/ty/tests/coercion.rs b/crates/ra_hir/src/ty/tests/coercion.rs
new file mode 100644
index 000000000..1530fcc63
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/coercion.rs
@@ -0,0 +1,369 @@
1use insta::assert_snapshot;
2use test_utils::covers;
3
4// Infer with some common definitions and impls.
5fn infer(source: &str) -> String {
6 let defs = r#"
7 #[lang = "sized"]
8 pub trait Sized {}
9 #[lang = "unsize"]
10 pub trait Unsize<T: ?Sized> {}
11 #[lang = "coerce_unsized"]
12 pub trait CoerceUnsized<T> {}
13
14 impl<'a, 'b: 'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<&'a U> for &'b T {}
15 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<*mut U> for *mut T {}
16 "#;
17
18 // Append to the end to keep positions unchanged.
19 super::infer(&format!("{}{}", source, defs))
20}
21
22#[test]
23fn infer_block_expr_type_mismatch() {
24 assert_snapshot!(
25 infer(r#"
26fn test() {
27 let a: i32 = { 1i64 };
28}
29"#),
30 @r###"
31 [11; 41) '{ ...4 }; }': ()
32 [21; 22) 'a': i32
33 [30; 38) '{ 1i64 }': i64
34 [32; 36) '1i64': i64
35 "###);
36}
37
38#[test]
39fn coerce_places() {
40 assert_snapshot!(
41 infer(r#"
42struct S<T> { a: T }
43
44fn f<T>(_: &[T]) -> T { loop {} }
45fn g<T>(_: S<&[T]>) -> T { loop {} }
46
47fn gen<T>() -> *mut [T; 2] { loop {} }
48fn test1<U>() -> *mut [U] {
49 gen()
50}
51
52fn test2() {
53 let arr: &[u8; 1] = &[1];
54
55 let a: &[_] = arr;
56 let b = f(arr);
57 let c: &[_] = { arr };
58 let d = g(S { a: arr });
59 let e: [&[_]; 1] = [arr];
60 let f: [&[_]; 2] = [arr; 2];
61 let g: (&[_], &[_]) = (arr, arr);
62}
63"#),
64 @r###"
65 [31; 32) '_': &[T]
66 [45; 56) '{ loop {} }': T
67 [47; 54) 'loop {}': !
68 [52; 54) '{}': ()
69 [65; 66) '_': S<&[T]>
70 [82; 93) '{ loop {} }': T
71 [84; 91) 'loop {}': !
72 [89; 91) '{}': ()
73 [122; 133) '{ loop {} }': *mut [T;_]
74 [124; 131) 'loop {}': !
75 [129; 131) '{}': ()
76 [160; 173) '{ gen() }': *mut [U]
77 [166; 169) 'gen': fn gen<U>() -> *mut [T;_]
78 [166; 171) 'gen()': *mut [U;_]
79 [186; 420) '{ ...rr); }': ()
80 [196; 199) 'arr': &[u8;_]
81 [212; 216) '&[1]': &[u8;_]
82 [213; 216) '[1]': [u8;_]
83 [214; 215) '1': u8
84 [227; 228) 'a': &[u8]
85 [237; 240) 'arr': &[u8;_]
86 [250; 251) 'b': u8
87 [254; 255) 'f': fn f<u8>(&[T]) -> T
88 [254; 260) 'f(arr)': u8
89 [256; 259) 'arr': &[u8;_]
90 [270; 271) 'c': &[u8]
91 [280; 287) '{ arr }': &[u8]
92 [282; 285) 'arr': &[u8;_]
93 [297; 298) 'd': u8
94 [301; 302) 'g': fn g<u8>(S<&[T]>) -> T
95 [301; 316) 'g(S { a: arr })': u8
96 [303; 315) 'S { a: arr }': S<&[u8]>
97 [310; 313) 'arr': &[u8;_]
98 [326; 327) 'e': [&[u8];_]
99 [341; 346) '[arr]': [&[u8];_]
100 [342; 345) 'arr': &[u8;_]
101 [356; 357) 'f': [&[u8];_]
102 [371; 379) '[arr; 2]': [&[u8];_]
103 [372; 375) 'arr': &[u8;_]
104 [377; 378) '2': usize
105 [389; 390) 'g': (&[u8], &[u8])
106 [407; 417) '(arr, arr)': (&[u8], &[u8])
107 [408; 411) 'arr': &[u8;_]
108 [413; 416) 'arr': &[u8;_]
109 "###
110 );
111}
112
113#[test]
114fn infer_let_stmt_coerce() {
115 assert_snapshot!(
116 infer(r#"
117fn test() {
118 let x: &[i32] = &[1];
119}
120"#),
121 @r###"
122 [11; 40) '{ ...[1]; }': ()
123 [21; 22) 'x': &[i32]
124 [33; 37) '&[1]': &[i32;_]
125 [34; 37) '[1]': [i32;_]
126 [35; 36) '1': i32
127 "###);
128}
129
130#[test]
131fn infer_custom_coerce_unsized() {
132 assert_snapshot!(
133 infer(r#"
134struct A<T: ?Sized>(*const T);
135struct B<T: ?Sized>(*const T);
136struct C<T: ?Sized> { inner: *const T }
137
138impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<B<U>> for B<T> {}
139impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<C<U>> for C<T> {}
140
141fn foo1<T>(x: A<[T]>) -> A<[T]> { x }
142fn foo2<T>(x: B<[T]>) -> B<[T]> { x }
143fn foo3<T>(x: C<[T]>) -> C<[T]> { x }
144
145fn test(a: A<[u8; 2]>, b: B<[u8; 2]>, c: C<[u8; 2]>) {
146 let d = foo1(a);
147 let e = foo2(b);
148 let f = foo3(c);
149}
150"#),
151 @r###"
152 [258; 259) 'x': A<[T]>
153 [279; 284) '{ x }': A<[T]>
154 [281; 282) 'x': A<[T]>
155 [296; 297) 'x': B<[T]>
156 [317; 322) '{ x }': B<[T]>
157 [319; 320) 'x': B<[T]>
158 [334; 335) 'x': C<[T]>
159 [355; 360) '{ x }': C<[T]>
160 [357; 358) 'x': C<[T]>
161 [370; 371) 'a': A<[u8;_]>
162 [385; 386) 'b': B<[u8;_]>
163 [400; 401) 'c': C<[u8;_]>
164 [415; 481) '{ ...(c); }': ()
165 [425; 426) 'd': A<[{unknown}]>
166 [429; 433) 'foo1': fn foo1<{unknown}>(A<[T]>) -> A<[T]>
167 [429; 436) 'foo1(a)': A<[{unknown}]>
168 [434; 435) 'a': A<[u8;_]>
169 [446; 447) 'e': B<[u8]>
170 [450; 454) 'foo2': fn foo2<u8>(B<[T]>) -> B<[T]>
171 [450; 457) 'foo2(b)': B<[u8]>
172 [455; 456) 'b': B<[u8;_]>
173 [467; 468) 'f': C<[u8]>
174 [471; 475) 'foo3': fn foo3<u8>(C<[T]>) -> C<[T]>
175 [471; 478) 'foo3(c)': C<[u8]>
176 [476; 477) 'c': C<[u8;_]>
177 "###
178 );
179}
180
181#[test]
182fn infer_if_coerce() {
183 assert_snapshot!(
184 infer(r#"
185fn foo<T>(x: &[T]) -> &[T] { loop {} }
186fn test() {
187 let x = if true {
188 foo(&[1])
189 } else {
190 &[1]
191 };
192}
193"#),
194 @r###"
195 [11; 12) 'x': &[T]
196 [28; 39) '{ loop {} }': &[T]
197 [30; 37) 'loop {}': !
198 [35; 37) '{}': ()
199 [50; 126) '{ ... }; }': ()
200 [60; 61) 'x': &[i32]
201 [64; 123) 'if tru... }': &[i32]
202 [67; 71) 'true': bool
203 [72; 97) '{ ... }': &[i32]
204 [82; 85) 'foo': fn foo<i32>(&[T]) -> &[T]
205 [82; 91) 'foo(&[1])': &[i32]
206 [86; 90) '&[1]': &[i32;_]
207 [87; 90) '[1]': [i32;_]
208 [88; 89) '1': i32
209 [103; 123) '{ ... }': &[i32;_]
210 [113; 117) '&[1]': &[i32;_]
211 [114; 117) '[1]': [i32;_]
212 [115; 116) '1': i32
213 "###
214 );
215}
216
217#[test]
218fn infer_if_else_coerce() {
219 assert_snapshot!(
220 infer(r#"
221fn foo<T>(x: &[T]) -> &[T] { loop {} }
222fn test() {
223 let x = if true {
224 &[1]
225 } else {
226 foo(&[1])
227 };
228}
229"#),
230 @r###"
231 [11; 12) 'x': &[T]
232 [28; 39) '{ loop {} }': &[T]
233 [30; 37) 'loop {}': !
234 [35; 37) '{}': ()
235 [50; 126) '{ ... }; }': ()
236 [60; 61) 'x': &[i32]
237 [64; 123) 'if tru... }': &[i32]
238 [67; 71) 'true': bool
239 [72; 92) '{ ... }': &[i32;_]
240 [82; 86) '&[1]': &[i32;_]
241 [83; 86) '[1]': [i32;_]
242 [84; 85) '1': i32
243 [98; 123) '{ ... }': &[i32]
244 [108; 111) 'foo': fn foo<i32>(&[T]) -> &[T]
245 [108; 117) 'foo(&[1])': &[i32]
246 [112; 116) '&[1]': &[i32;_]
247 [113; 116) '[1]': [i32;_]
248 [114; 115) '1': i32
249 "###
250 );
251}
252
253#[test]
254fn infer_match_first_coerce() {
255 assert_snapshot!(
256 infer(r#"
257fn foo<T>(x: &[T]) -> &[T] { loop {} }
258fn test(i: i32) {
259 let x = match i {
260 2 => foo(&[2]),
261 1 => &[1],
262 _ => &[3],
263 };
264}
265"#),
266 @r###"
267 [11; 12) 'x': &[T]
268 [28; 39) '{ loop {} }': &[T]
269 [30; 37) 'loop {}': !
270 [35; 37) '{}': ()
271 [48; 49) 'i': i32
272 [56; 150) '{ ... }; }': ()
273 [66; 67) 'x': &[i32]
274 [70; 147) 'match ... }': &[i32]
275 [76; 77) 'i': i32
276 [88; 89) '2': i32
277 [93; 96) 'foo': fn foo<i32>(&[T]) -> &[T]
278 [93; 102) 'foo(&[2])': &[i32]
279 [97; 101) '&[2]': &[i32;_]
280 [98; 101) '[2]': [i32;_]
281 [99; 100) '2': i32
282 [112; 113) '1': i32
283 [117; 121) '&[1]': &[i32;_]
284 [118; 121) '[1]': [i32;_]
285 [119; 120) '1': i32
286 [131; 132) '_': i32
287 [136; 140) '&[3]': &[i32;_]
288 [137; 140) '[3]': [i32;_]
289 [138; 139) '3': i32
290 "###
291 );
292}
293
294#[test]
295fn infer_match_second_coerce() {
296 assert_snapshot!(
297 infer(r#"
298fn foo<T>(x: &[T]) -> &[T] { loop {} }
299fn test(i: i32) {
300 let x = match i {
301 1 => &[1],
302 2 => foo(&[2]),
303 _ => &[3],
304 };
305}
306"#),
307 @r###"
308 [11; 12) 'x': &[T]
309 [28; 39) '{ loop {} }': &[T]
310 [30; 37) 'loop {}': !
311 [35; 37) '{}': ()
312 [48; 49) 'i': i32
313 [56; 150) '{ ... }; }': ()
314 [66; 67) 'x': &[i32]
315 [70; 147) 'match ... }': &[i32]
316 [76; 77) 'i': i32
317 [88; 89) '1': i32
318 [93; 97) '&[1]': &[i32;_]
319 [94; 97) '[1]': [i32;_]
320 [95; 96) '1': i32
321 [107; 108) '2': i32
322 [112; 115) 'foo': fn foo<i32>(&[T]) -> &[T]
323 [112; 121) 'foo(&[2])': &[i32]
324 [116; 120) '&[2]': &[i32;_]
325 [117; 120) '[2]': [i32;_]
326 [118; 119) '2': i32
327 [131; 132) '_': i32
328 [136; 140) '&[3]': &[i32;_]
329 [137; 140) '[3]': [i32;_]
330 [138; 139) '3': i32
331 "###
332 );
333}
334
335#[test]
336fn coerce_merge_one_by_one1() {
337 covers!(coerce_merge_fail_fallback);
338
339 assert_snapshot!(
340 infer(r#"
341fn test() {
342 let t = &mut 1;
343 let x = match 1 {
344 1 => t as *mut i32,
345 2 => t as &i32,
346 _ => t as *const i32,
347 };
348}
349"#),
350 @r###"
351 [11; 145) '{ ... }; }': ()
352 [21; 22) 't': &mut i32
353 [25; 31) '&mut 1': &mut i32
354 [30; 31) '1': i32
355 [41; 42) 'x': *const i32
356 [45; 142) 'match ... }': *const i32
357 [51; 52) '1': i32
358 [63; 64) '1': i32
359 [68; 69) 't': &mut i32
360 [68; 81) 't as *mut i32': *mut i32
361 [91; 92) '2': i32
362 [96; 97) 't': &mut i32
363 [96; 105) 't as &i32': &i32
364 [115; 116) '_': i32
365 [120; 121) 't': &mut i32
366 [120; 135) 't as *const i32': *const i32
367 "###
368 );
369}
diff --git a/crates/ra_hir/src/ty/tests/never_type.rs b/crates/ra_hir/src/ty/tests/never_type.rs
new file mode 100644
index 000000000..c202f545a
--- /dev/null
+++ b/crates/ra_hir/src/ty/tests/never_type.rs
@@ -0,0 +1,246 @@
1use super::type_at;
2
3#[test]
4fn infer_never1() {
5 let t = type_at(
6 r#"
7//- /main.rs
8fn test() {
9 let t = return;
10 t<|>;
11}
12"#,
13 );
14 assert_eq!(t, "!");
15}
16
17#[test]
18fn infer_never2() {
19 let t = type_at(
20 r#"
21//- /main.rs
22fn gen<T>() -> T { loop {} }
23
24fn test() {
25 let a = gen();
26 if false { a } else { loop {} };
27 a<|>;
28}
29"#,
30 );
31 assert_eq!(t, "!");
32}
33
34#[test]
35fn infer_never3() {
36 let t = type_at(
37 r#"
38//- /main.rs
39fn gen<T>() -> T { loop {} }
40
41fn test() {
42 let a = gen();
43 if false { loop {} } else { a };
44 a<|>;
45}
46"#,
47 );
48 assert_eq!(t, "!");
49}
50
51#[test]
52fn never_type_in_generic_args() {
53 let t = type_at(
54 r#"
55//- /main.rs
56enum Option<T> { None, Some(T) }
57
58fn test() {
59 let a = if true { Option::None } else { Option::Some(return) };
60 a<|>;
61}
62"#,
63 );
64 assert_eq!(t, "Option<!>");
65}
66
67#[test]
68fn never_type_can_be_reinferred1() {
69 let t = type_at(
70 r#"
71//- /main.rs
72fn gen<T>() -> T { loop {} }
73
74fn test() {
75 let a = gen();
76 if false { loop {} } else { a };
77 a<|>;
78 if false { a };
79}
80"#,
81 );
82 assert_eq!(t, "()");
83}
84
85#[test]
86fn never_type_can_be_reinferred2() {
87 let t = type_at(
88 r#"
89//- /main.rs
90enum Option<T> { None, Some(T) }
91
92fn test() {
93 let a = if true { Option::None } else { Option::Some(return) };
94 a<|>;
95 match 42 {
96 42 => a,
97 _ => Option::Some(42),
98 };
99}
100"#,
101 );
102 assert_eq!(t, "Option<i32>");
103}
104#[test]
105fn never_type_can_be_reinferred3() {
106 let t = type_at(
107 r#"
108//- /main.rs
109enum Option<T> { None, Some(T) }
110
111fn test() {
112 let a = if true { Option::None } else { Option::Some(return) };
113 a<|>;
114 match 42 {
115 42 => a,
116 _ => Option::Some("str"),
117 };
118}
119"#,
120 );
121 assert_eq!(t, "Option<&str>");
122}
123
124#[test]
125fn match_no_arm() {
126 let t = type_at(
127 r#"
128//- /main.rs
129enum Void {}
130
131fn test(a: Void) {
132 let t = match a {};
133 t<|>;
134}
135"#,
136 );
137 assert_eq!(t, "!");
138}
139
140#[test]
141fn if_never() {
142 let t = type_at(
143 r#"
144//- /main.rs
145fn test() {
146 let i = if true {
147 loop {}
148 } else {
149 3.0
150 };
151 i<|>;
152}
153"#,
154 );
155 assert_eq!(t, "f64");
156}
157
158#[test]
159fn if_else_never() {
160 let t = type_at(
161 r#"
162//- /main.rs
163fn test(input: bool) {
164 let i = if input {
165 2.0
166 } else {
167 return
168 };
169 i<|>;
170}
171"#,
172 );
173 assert_eq!(t, "f64");
174}
175
176#[test]
177fn match_first_arm_never() {
178 let t = type_at(
179 r#"
180//- /main.rs
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}
190"#,
191 );
192 assert_eq!(t, "f64");
193}
194
195#[test]
196fn match_second_arm_never() {
197 let t = type_at(
198 r#"
199//- /main.rs
200fn test(a: i32) {
201 let i = match a {
202 1 => 3.0,
203 2 => loop {},
204 3 => 3.0,
205 _ => return,
206 };
207 i<|>;
208}
209"#,
210 );
211 assert_eq!(t, "f64");
212}
213
214#[test]
215fn match_all_arms_never() {
216 let t = type_at(
217 r#"
218//- /main.rs
219fn test(a: i32) {
220 let i = match a {
221 2 => return,
222 _ => loop {},
223 };
224 i<|>;
225}
226"#,
227 );
228 assert_eq!(t, "!");
229}
230
231#[test]
232fn match_no_never_arms() {
233 let t = type_at(
234 r#"
235//- /main.rs
236fn test(a: i32) {
237 let i = match a {
238 2 => 2.0,
239 _ => 3.0,
240 };
241 i<|>;
242}
243"#,
244 );
245 assert_eq!(t, "f64");
246}