aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir_ty/src/tests/patterns.rs
blob: e5ef241caefcd2ed92cd5c540267d3453dd5743f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
use insta::assert_snapshot;
use test_utils::mark;

use super::{infer, infer_with_mismatches};

#[test]
fn infer_pattern() {
    assert_snapshot!(
        infer(r#"
fn test(x: &i32) {
    let y = x;
    let &z = x;
    let a = z;
    let (c, d) = (1, "hello");

    for (e, f) in some_iter {
        let g = e;
    }

    if let [val] = opt {
        let h = val;
    }

    let lambda = |a: u64, b, c: i32| { a + b; c };

    let ref ref_to_x = x;
    let mut mut_x = x;
    let ref mut mut_ref_to_x = x;
    let k = mut_ref_to_x;
}
"#),
        @r###"
    8..9 'x': &i32
    17..368 '{     ...o_x; }': ()
    27..28 'y': &i32
    31..32 'x': &i32
    42..44 '&z': &i32
    43..44 'z': i32
    47..48 'x': &i32
    58..59 'a': i32
    62..63 'z': i32
    73..79 '(c, d)': (i32, &str)
    74..75 'c': i32
    77..78 'd': &str
    82..94 '(1, "hello")': (i32, &str)
    83..84 '1': i32
    86..93 '"hello"': &str
    101..151 'for (e...     }': ()
    105..111 '(e, f)': ({unknown}, {unknown})
    106..107 'e': {unknown}
    109..110 'f': {unknown}
    115..124 'some_iter': {unknown}
    125..151 '{     ...     }': ()
    139..140 'g': {unknown}
    143..144 'e': {unknown}
    157..204 'if let...     }': ()
    164..169 '[val]': [{unknown}]
    165..168 'val': {unknown}
    172..175 'opt': [{unknown}]
    176..204 '{     ...     }': ()
    190..191 'h': {unknown}
    194..197 'val': {unknown}
    214..220 'lambda': |u64, u64, i32| -> i32
    223..255 '|a: u6...b; c }': |u64, u64, i32| -> i32
    224..225 'a': u64
    232..233 'b': u64
    235..236 'c': i32
    243..255 '{ a + b; c }': i32
    245..246 'a': u64
    245..250 'a + b': u64
    249..250 'b': u64
    252..253 'c': i32
    266..278 'ref ref_to_x': &&i32
    281..282 'x': &i32
    292..301 'mut mut_x': &i32
    304..305 'x': &i32
    315..335 'ref mu...f_to_x': &mut &i32
    338..339 'x': &i32
    349..350 'k': &mut &i32
    353..365 'mut_ref_to_x': &mut &i32
    "###
    );
}

#[test]
fn infer_literal_pattern() {
    assert_snapshot!(
        infer_with_mismatches(r#"
fn any<T>() -> T { loop {} }
fn test(x: &i32) {
    if let "foo" = any() {}
    if let 1 = any() {}
    if let 1u32 = any() {}
    if let 1f32 = any() {}
    if let 1.0 = any() {}
    if let true = any() {}
}
"#, true),
        @r###"
    17..28 '{ loop {} }': T
    19..26 'loop {}': !
    24..26 '{}': ()
    37..38 'x': &i32
    46..208 '{     ...) {} }': ()
    52..75 'if let...y() {}': ()
    59..64 '"foo"': &str
    59..64 '"foo"': &str
    67..70 'any': fn any<&str>() -> &str
    67..72 'any()': &str
    73..75 '{}': ()
    80..99 'if let...y() {}': ()
    87..88 '1': i32
    87..88 '1': i32
    91..94 'any': fn any<i32>() -> i32
    91..96 'any()': i32
    97..99 '{}': ()
    104..126 'if let...y() {}': ()
    111..115 '1u32': u32
    111..115 '1u32': u32
    118..121 'any': fn any<u32>() -> u32
    118..123 'any()': u32
    124..126 '{}': ()
    131..153 'if let...y() {}': ()
    138..142 '1f32': f32
    138..142 '1f32': f32
    145..148 'any': fn any<f32>() -> f32
    145..150 'any()': f32
    151..153 '{}': ()
    158..179 'if let...y() {}': ()
    165..168 '1.0': f64
    165..168 '1.0': f64
    171..174 'any': fn any<f64>() -> f64
    171..176 'any()': f64
    177..179 '{}': ()
    184..206 'if let...y() {}': ()
    191..195 'true': bool
    191..195 'true': bool
    198..201 'any': fn any<bool>() -> bool
    198..203 'any()': bool
    204..206 '{}': ()
    "###
    );
}

#[test]
fn infer_range_pattern() {
    assert_snapshot!(
        infer_with_mismatches(r#"
fn test(x: &i32) {
    if let 1..76 = 2u32 {}
    if let 1..=76 = 2u32 {}
}
"#, true),
        @r###"
    8..9 'x': &i32
    17..75 '{     ...2 {} }': ()
    23..45 'if let...u32 {}': ()
    30..35 '1..76': u32
    38..42 '2u32': u32
    43..45 '{}': ()
    50..73 'if let...u32 {}': ()
    57..63 '1..=76': u32
    66..70 '2u32': u32
    71..73 '{}': ()
    "###
    );
}

#[test]
fn infer_pattern_match_ergonomics() {
    assert_snapshot!(
        infer(r#"
struct A<T>(T);

fn test() {
    let A(n) = &A(1);
    let A(n) = &mut A(1);
}
"#),
    @r###"
    27..78 '{     ...(1); }': ()
    37..41 'A(n)': A<i32>
    39..40 'n': &i32
    44..49 '&A(1)': &A<i32>
    45..46 'A': A<i32>(i32) -> A<i32>
    45..49 'A(1)': A<i32>
    47..48 '1': i32
    59..63 'A(n)': A<i32>
    61..62 'n': &mut i32
    66..75 '&mut A(1)': &mut A<i32>
    71..72 'A': A<i32>(i32) -> A<i32>
    71..75 'A(1)': A<i32>
    73..74 '1': i32
    "###
    );
}

#[test]
fn infer_pattern_match_ergonomics_ref() {
    mark::check!(match_ergonomics_ref);
    assert_snapshot!(
        infer(r#"
fn test() {
    let v = &(1, &2);
    let (_, &w) = v;
}
"#),
    @r###"
    10..56 '{     ...= v; }': ()
    20..21 'v': &(i32, &i32)
    24..32 '&(1, &2)': &(i32, &i32)
    25..32 '(1, &2)': (i32, &i32)
    26..27 '1': i32
    29..31 '&2': &i32
    30..31 '2': i32
    42..49 '(_, &w)': (i32, &i32)
    43..44 '_': i32
    46..48 '&w': &i32
    47..48 'w': i32
    52..53 'v': &(i32, &i32)
    "###
    );
}

#[test]
fn infer_pattern_match_slice() {
    assert_snapshot!(
        infer(r#"
fn test() {
    let slice: &[f64] = &[0.0];
    match slice {
        &[] => {},
        &[a] => {
            a;
        },
        &[b, c] => {
            b;
            c;
        }
        _ => {}
    }
}
"#),
    @r###"
    10..209 '{     ...   } }': ()
    20..25 'slice': &[f64]
    36..42 '&[0.0]': &[f64; _]
    37..42 '[0.0]': [f64; _]
    38..41 '0.0': f64
    48..207 'match ...     }': ()
    54..59 'slice': &[f64]
    70..73 '&[]': &[f64]
    71..73 '[]': [f64]
    77..79 '{}': ()
    89..93 '&[a]': &[f64]
    90..93 '[a]': [f64]
    91..92 'a': f64
    97..123 '{     ...     }': ()
    111..112 'a': f64
    133..140 '&[b, c]': &[f64]
    134..140 '[b, c]': [f64]
    135..136 'b': f64
    138..139 'c': f64
    144..185 '{     ...     }': ()
    158..159 'b': f64
    173..174 'c': f64
    194..195 '_': &[f64]
    199..201 '{}': ()
    "###
    );
}

#[test]
fn infer_pattern_match_string_literal() {
    assert_snapshot!(
        infer_with_mismatches(r#"
fn test() {
    let s: &str = "hello";
    match s {
        "hello" => {}
        _ => {}
    }
}
"#, true),
    @r###"
    10..98 '{     ...   } }': ()
    20..21 's': &str
    30..37 '"hello"': &str
    43..96 'match ...     }': ()
    49..50 's': &str
    61..68 '"hello"': &str
    61..68 '"hello"': &str
    72..74 '{}': ()
    83..84 '_': &str
    88..90 '{}': ()
    "###
    );
}

#[test]
fn infer_pattern_match_or() {
    assert_snapshot!(
        infer_with_mismatches(r#"
fn test() {
    let s: &str = "hello";
    match s {
        "hello" | "world" => {}
        _ => {}
    }
}
"#, true),
    @r###"
    10..108 '{     ...   } }': ()
    20..21 's': &str
    30..37 '"hello"': &str
    43..106 'match ...     }': ()
    49..50 's': &str
    61..68 '"hello"': &str
    61..68 '"hello"': &str
    61..78 '"hello...world"': &str
    71..78 '"world"': &str
    71..78 '"world"': &str
    82..84 '{}': ()
    93..94 '_': &str
    98..100 '{}': ()
    "###
    );
}

#[test]
fn infer_pattern_match_arr() {
    assert_snapshot!(
        infer(r#"
fn test() {
    let arr: [f64; 2] = [0.0, 1.0];
    match arr {
        [1.0, a] => {
            a;
        },
        [b, c] => {
            b;
            c;
        }
    }
}
"#),
    @r###"
    10..179 '{     ...   } }': ()
    20..23 'arr': [f64; _]
    36..46 '[0.0, 1.0]': [f64; _]
    37..40 '0.0': f64
    42..45 '1.0': f64
    52..177 'match ...     }': ()
    58..61 'arr': [f64; _]
    72..80 '[1.0, a]': [f64; _]
    73..76 '1.0': f64
    73..76 '1.0': f64
    78..79 'a': f64
    84..110 '{     ...     }': ()
    98..99 'a': f64
    120..126 '[b, c]': [f64; _]
    121..122 'b': f64
    124..125 'c': f64
    130..171 '{     ...     }': ()
    144..145 'b': f64
    159..160 'c': f64
    "###
    );
}

#[test]
fn infer_adt_pattern() {
    assert_snapshot!(
        infer(r#"
enum E {
    A { x: usize },
    B
}

struct S(u32, E);

fn test() {
    let e = E::A { x: 3 };

    let S(y, z) = foo;
    let E::A { x: new_var } = e;

    match e {
        E::A { x } => x,
        E::B if foo => 1,
        E::B => 10,
    };

    let ref d @ E::A { .. } = e;
    d;
}
"#),
        @r###"
    67..288 '{     ...  d; }': ()
    77..78 'e': E
    81..94 'E::A { x: 3 }': E
    91..92 '3': usize
    105..112 'S(y, z)': S
    107..108 'y': u32
    110..111 'z': E
    115..118 'foo': S
    128..147 'E::A {..._var }': E
    138..145 'new_var': usize
    150..151 'e': E
    158..244 'match ...     }': usize
    164..165 'e': E
    176..186 'E::A { x }': E
    183..184 'x': usize
    190..191 'x': usize
    201..205 'E::B': E
    209..212 'foo': bool
    216..217 '1': usize
    227..231 'E::B': E
    235..237 '10': usize
    255..274 'ref d ...{ .. }': &E
    263..274 'E::A { .. }': E
    277..278 'e': E
    284..285 'd': &E
    "###
    );
}

#[test]
fn enum_variant_through_self_in_pattern() {
    assert_snapshot!(
        infer(r#"
enum E {
    A { x: usize },
    B(usize),
    C
}

impl E {
    fn test() {
        match (loop {}) {
            Self::A { x } => { x; },
            Self::B(x) => { x; },
            Self::C => {},
        };
    }
}
"#),
        @r###"
    75..217 '{     ...     }': ()
    85..210 'match ...     }': ()
    92..99 'loop {}': !
    97..99 '{}': ()
    115..128 'Self::A { x }': E
    125..126 'x': usize
    132..138 '{ x; }': ()
    134..135 'x': usize
    152..162 'Self::B(x)': E
    160..161 'x': usize
    166..172 '{ x; }': ()
    168..169 'x': usize
    186..193 'Self::C': E
    197..199 '{}': ()
    "###
    );
}

#[test]
fn infer_generics_in_patterns() {
    assert_snapshot!(
        infer(r#"
struct A<T> {
    x: T,
}

enum Option<T> {
    Some(T),
    None,
}

fn test(a1: A<u32>, o: Option<u64>) {
    let A { x: x2 } = a1;
    let A::<i64> { x: x3 } = A { x: 1 };
    match o {
        Option::Some(t) => t,
        _ => 1,
    };
}
"#),
        @r###"
    78..80 'a1': A<u32>
    90..91 'o': Option<u64>
    106..243 '{     ...  }; }': ()
    116..127 'A { x: x2 }': A<u32>
    123..125 'x2': u32
    130..132 'a1': A<u32>
    142..160 'A::<i6...: x3 }': A<i64>
    156..158 'x3': i64
    163..173 'A { x: 1 }': A<i64>
    170..171 '1': i64
    179..240 'match ...     }': u64
    185..186 'o': Option<u64>
    197..212 'Option::Some(t)': Option<u64>
    210..211 't': u64
    216..217 't': u64
    227..228 '_': Option<u64>
    232..233 '1': u64
    "###
    );
}

#[test]
fn infer_const_pattern() {
    assert_snapshot!(
        infer_with_mismatches(r#"
enum Option<T> { None }
use Option::None;
struct Foo;
const Bar: usize = 1;

fn test() {
    let a: Option<u32> = None;
    let b: Option<i64> = match a {
        None => None,
    };
    let _: () = match () { Foo => Foo }; // Expected mismatch
    let _: () = match () { Bar => Bar }; // Expected mismatch
}
"#, true),
        @r###"
    73..74 '1': usize
    87..309 '{     ...atch }': ()
    97..98 'a': Option<u32>
    114..118 'None': Option<u32>
    128..129 'b': Option<i64>
    145..182 'match ...     }': Option<i64>
    151..152 'a': Option<u32>
    163..167 'None': Option<u32>
    171..175 'None': Option<i64>
    192..193 '_': ()
    200..223 'match ... Foo }': Foo
    206..208 '()': ()
    211..214 'Foo': Foo
    218..221 'Foo': Foo
    254..255 '_': ()
    262..285 'match ... Bar }': usize
    268..270 '()': ()
    273..276 'Bar': usize
    280..283 'Bar': usize
    200..223: expected (), got Foo
    262..285: expected (), got usize
    "###
    );
}

#[test]
fn infer_guard() {
    assert_snapshot!(
        infer(r#"
struct S;
impl S { fn foo(&self) -> bool { false } }

fn main() {
    match S {
        s if s.foo() => (),
    }
}
    "#), @r###"
    27..31 'self': &S
    41..50 '{ false }': bool
    43..48 'false': bool
    64..115 '{     ...   } }': ()
    70..113 'match ...     }': ()
    76..77 'S': S
    88..89 's': S
    93..94 's': S
    93..100 's.foo()': bool
    104..106 '()': ()
    "###)
}

#[test]
fn match_ergonomics_in_closure_params() {
    assert_snapshot!(
        infer(r#"
#[lang = "fn_once"]
trait FnOnce<Args> {
    type Output;
}

fn foo<T, U, F: FnOnce(T) -> U>(t: T, f: F) -> U { loop {} }

fn test() {
    foo(&(1, "a"), |&(x, y)| x); // normal, no match ergonomics
    foo(&(1, "a"), |(x, y)| x);
}
"#),
        @r###"
    93..94 't': T
    99..100 'f': F
    110..121 '{ loop {} }': U
    112..119 'loop {}': !
    117..119 '{}': ()
    133..232 '{     ... x); }': ()
    139..142 'foo': fn foo<&(i32, &str), i32, |&(i32, &str)| -> i32>(&(i32, &str), |&(i32, &str)| -> i32) -> i32
    139..166 'foo(&(...y)| x)': i32
    143..152 '&(1, "a")': &(i32, &str)
    144..152 '(1, "a")': (i32, &str)
    145..146 '1': i32
    148..151 '"a"': &str
    154..165 '|&(x, y)| x': |&(i32, &str)| -> i32
    155..162 '&(x, y)': &(i32, &str)
    156..162 '(x, y)': (i32, &str)
    157..158 'x': i32
    160..161 'y': &str
    164..165 'x': i32
    203..206 'foo': fn foo<&(i32, &str), &i32, |&(i32, &str)| -> &i32>(&(i32, &str), |&(i32, &str)| -> &i32) -> &i32
    203..229 'foo(&(...y)| x)': &i32
    207..216 '&(1, "a")': &(i32, &str)
    208..216 '(1, "a")': (i32, &str)
    209..210 '1': i32
    212..215 '"a"': &str
    218..228 '|(x, y)| x': |&(i32, &str)| -> &i32
    219..225 '(x, y)': (i32, &str)
    220..221 'x': &i32
    223..224 'y': &&str
    227..228 'x': &i32
    "###
    );
}