src/tools/rust-analyzer/crates/hir-ty/src/tests/patterns.rs

   1 use expect_test::expect;
   2
   3 use super::{check, check_infer, check_infer_with_mismatches, check_types};
   4
   5 #[test]
   6 fn infer_pattern() {
   7     check_infer(
   8         r#"
   9         fn test(x: &i32) {
  10             let y = x;
  11             let &z = x;
  12             let a = z;
  13             let (c, d) = (1, "hello");
  14
  15             for (e, f) in some_iter {
  16                 let g = e;
  17             }
  18
  19             if let [val] = opt {
  20                 let h = val;
  21             }
  22
  23             if let x @ true = &true {}
  24
  25             let lambda = |a: u64, b, c: i32| { a + b; c };
  26
  27             let ref ref_to_x = x;
  28             let mut mut_x = x;
  29             let ref mut mut_ref_to_x = x;
  30             let k = mut_ref_to_x;
  31         }
  32         "#,
  33         expect![[r#"
  34             8..9 'x': &i32
  35             17..400 '{     ...o_x; }': ()
  36             27..28 'y': &i32
  37             31..32 'x': &i32
  38             42..44 '&z': &i32
  39             43..44 'z': i32
  40             47..48 'x': &i32
  41             58..59 'a': i32
  42             62..63 'z': i32
  43             73..79 '(c, d)': (i32, &str)
  44             74..75 'c': i32
  45             77..78 'd': &str
  46             82..94 '(1, "hello")': (i32, &str)
  47             83..84 '1': i32
  48             86..93 '"hello"': &str
  49             101..151 'for (e...     }': ()
  50             105..111 '(e, f)': ({unknown}, {unknown})
  51             106..107 'e': {unknown}
  52             109..110 'f': {unknown}
  53             115..124 'some_iter': {unknown}
  54             125..151 '{     ...     }': ()
  55             139..140 'g': {unknown}
  56             143..144 'e': {unknown}
  57             157..204 'if let...     }': ()
  58             160..175 'let [val] = opt': bool
  59             164..169 '[val]': [{unknown}]
  60             165..168 'val': {unknown}
  61             172..175 'opt': [{unknown}]
  62             176..204 '{     ...     }': ()
  63             190..191 'h': {unknown}
  64             194..197 'val': {unknown}
  65             210..236 'if let...rue {}': ()
  66             213..233 'let x ... &true': bool
  67             217..225 'x @ true': &bool
  68             221..225 'true': bool
  69             221..225 'true': bool
  70             228..233 '&true': &bool
  71             229..233 'true': bool
  72             234..236 '{}': ()
  73             246..252 'lambda': |u64, u64, i32| -> i32
  74             255..287 '|a: u6...b; c }': |u64, u64, i32| -> i32
  75             256..257 'a': u64
  76             264..265 'b': u64
  77             267..268 'c': i32
  78             275..287 '{ a + b; c }': i32
  79             277..278 'a': u64
  80             277..282 'a + b': u64
  81             281..282 'b': u64
  82             284..285 'c': i32
  83             298..310 'ref ref_to_x': &&i32
  84             313..314 'x': &i32
  85             324..333 'mut mut_x': &i32
  86             336..337 'x': &i32
  87             347..367 'ref mu...f_to_x': &mut &i32
  88             370..371 'x': &i32
  89             381..382 'k': &mut &i32
  90             385..397 'mut_ref_to_x': &mut &i32
  91         "#]],
  92     );
  93 }
  94
  95 #[test]
  96 fn infer_literal_pattern() {
  97     check_infer_with_mismatches(
  98         r#"
  99         fn any<T>() -> T { loop {} }
 100         fn test(x: &i32) {
 101             if let "foo" = any() {}
 102             if let 1 = any() {}
 103             if let 1u32 = any() {}
 104             if let 1f32 = any() {}
 105             if let 1.0 = any() {}
 106             if let true = any() {}
 107         }
 108         "#,
 109         expect![[r#"
 110             17..28 '{ loop {} }': T
 111             19..26 'loop {}': !
 112             24..26 '{}': ()
 113             37..38 'x': &i32
 114             46..208 '{     ...) {} }': ()
 115             52..75 'if let...y() {}': ()
 116             55..72 'let "f... any()': bool
 117             59..64 '"foo"': &str
 118             59..64 '"foo"': &str
 119             67..70 'any': fn any<&str>() -> &str
 120             67..72 'any()': &str
 121             73..75 '{}': ()
 122             80..99 'if let...y() {}': ()
 123             83..96 'let 1 = any()': bool
 124             87..88 '1': i32
 125             87..88 '1': i32
 126             91..94 'any': fn any<i32>() -> i32
 127             91..96 'any()': i32
 128             97..99 '{}': ()
 129             104..126 'if let...y() {}': ()
 130             107..123 'let 1u... any()': bool
 131             111..115 '1u32': u32
 132             111..115 '1u32': u32
 133             118..121 'any': fn any<u32>() -> u32
 134             118..123 'any()': u32
 135             124..126 '{}': ()
 136             131..153 'if let...y() {}': ()
 137             134..150 'let 1f... any()': bool
 138             138..142 '1f32': f32
 139             138..142 '1f32': f32
 140             145..148 'any': fn any<f32>() -> f32
 141             145..150 'any()': f32
 142             151..153 '{}': ()
 143             158..179 'if let...y() {}': ()
 144             161..176 'let 1.0 = any()': bool
 145             165..168 '1.0': f64
 146             165..168 '1.0': f64
 147             171..174 'any': fn any<f64>() -> f64
 148             171..176 'any()': f64
 149             177..179 '{}': ()
 150             184..206 'if let...y() {}': ()
 151             187..203 'let tr... any()': bool
 152             191..195 'true': bool
 153             191..195 'true': bool
 154             198..201 'any': fn any<bool>() -> bool
 155             198..203 'any()': bool
 156             204..206 '{}': ()
 157         "#]],
 158     );
 159 }
 160
 161 #[test]
 162 fn infer_range_pattern() {
 163     check_infer_with_mismatches(
 164         r#"
 165         fn test(x: &i32) {
 166             if let 1..76 = 2u32 {}
 167             if let 1..=76 = 2u32 {}
 168         }
 169         "#,
 170         expect![[r#"
 171             8..9 'x': &i32
 172             17..75 '{     ...2 {} }': ()
 173             23..45 'if let...u32 {}': ()
 174             26..42 'let 1....= 2u32': bool
 175             30..35 '1..76': u32
 176             38..42 '2u32': u32
 177             43..45 '{}': ()
 178             50..73 'if let...u32 {}': ()
 179             53..70 'let 1....= 2u32': bool
 180             57..63 '1..=76': u32
 181             66..70 '2u32': u32
 182             71..73 '{}': ()
 183         "#]],
 184     );
 185 }
 186
 187 #[test]
 188 fn infer_pattern_match_ergonomics() {
 189     check_infer(
 190         r#"
 191         struct A<T>(T);
 192
 193         fn test() {
 194             let A(n) = &A(1);
 195             let A(n) = &mut A(1);
 196         }
 197         "#,
 198         expect![[r#"
 199             27..78 '{     ...(1); }': ()
 200             37..41 'A(n)': A<i32>
 201             39..40 'n': &i32
 202             44..49 '&A(1)': &A<i32>
 203             45..46 'A': A<i32>(i32) -> A<i32>
 204             45..49 'A(1)': A<i32>
 205             47..48 '1': i32
 206             59..63 'A(n)': A<i32>
 207             61..62 'n': &mut i32
 208             66..75 '&mut A(1)': &mut A<i32>
 209             71..72 'A': A<i32>(i32) -> A<i32>
 210             71..75 'A(1)': A<i32>
 211             73..74 '1': i32
 212         "#]],
 213     );
 214 }
 215
 216 #[test]
 217 fn infer_pattern_match_ergonomics_ref() {
 218     cov_mark::check!(match_ergonomics_ref);
 219     check_infer(
 220         r#"
 221         fn test() {
 222             let v = &(1, &2);
 223             let (_, &w) = v;
 224         }
 225         "#,
 226         expect![[r#"
 227             10..56 '{     ...= v; }': ()
 228             20..21 'v': &(i32, &i32)
 229             24..32 '&(1, &2)': &(i32, &i32)
 230             25..32 '(1, &2)': (i32, &i32)
 231             26..27 '1': i32
 232             29..31 '&2': &i32
 233             30..31 '2': i32
 234             42..49 '(_, &w)': (i32, &i32)
 235             43..44 '_': i32
 236             46..48 '&w': &i32
 237             47..48 'w': i32
 238             52..53 'v': &(i32, &i32)
 239         "#]],
 240     );
 241 }
 242
 243 #[test]
 244 fn infer_pattern_match_slice() {
 245     check_infer(
 246         r#"
 247         fn test() {
 248             let slice: &[f64] = &[0.0];
 249             match slice {
 250                 &[] => {},
 251                 &[a] => {
 252                     a;
 253                 },
 254                 &[b, c] => {
 255                     b;
 256                     c;
 257                 }
 258                 _ => {}
 259             }
 260         }
 261         "#,
 262         expect![[r#"
 263             10..209 '{     ...   } }': ()
 264             20..25 'slice': &[f64]
 265             36..42 '&[0.0]': &[f64; 1]
 266             37..42 '[0.0]': [f64; 1]
 267             38..41 '0.0': f64
 268             48..207 'match ...     }': ()
 269             54..59 'slice': &[f64]
 270             70..73 '&[]': &[f64]
 271             71..73 '[]': [f64]
 272             77..79 '{}': ()
 273             89..93 '&[a]': &[f64]
 274             90..93 '[a]': [f64]
 275             91..92 'a': f64
 276             97..123 '{     ...     }': ()
 277             111..112 'a': f64
 278             133..140 '&[b, c]': &[f64]
 279             134..140 '[b, c]': [f64]
 280             135..136 'b': f64
 281             138..139 'c': f64
 282             144..185 '{     ...     }': ()
 283             158..159 'b': f64
 284             173..174 'c': f64
 285             194..195 '_': &[f64]
 286             199..201 '{}': ()
 287         "#]],
 288     );
 289 }
 290
 291 #[test]
 292 fn infer_pattern_match_string_literal() {
 293     check_infer_with_mismatches(
 294         r#"
 295         fn test() {
 296             let s: &str = "hello";
 297             match s {
 298                 "hello" => {}
 299                 _ => {}
 300             }
 301         }
 302         "#,
 303         expect![[r#"
 304             10..98 '{     ...   } }': ()
 305             20..21 's': &str
 306             30..37 '"hello"': &str
 307             43..96 'match ...     }': ()
 308             49..50 's': &str
 309             61..68 '"hello"': &str
 310             61..68 '"hello"': &str
 311             72..74 '{}': ()
 312             83..84 '_': &str
 313             88..90 '{}': ()
 314         "#]],
 315     );
 316 }
 317
 318 #[test]
 319 fn infer_pattern_match_byte_string_literal() {
 320     check_infer_with_mismatches(
 321         r#"
 322         //- minicore: index
 323         struct S;
 324         impl<T, const N: usize> core::ops::Index<S> for [T; N] {
 325             type Output = [u8];
 326             fn index(&self, index: core::ops::RangeFull) -> &Self::Output {
 327                 loop {}
 328             }
 329         }
 330         fn test(v: [u8; 3]) {
 331             if let b"foo" = &v[S] {}
 332             if let b"foo" = &v {}
 333         }
 334         "#,
 335         expect![[r#"
 336             105..109 'self': &[T; N]
 337             111..116 'index': {unknown}
 338             157..180 '{     ...     }': &[u8]
 339             167..174 'loop {}': !
 340             172..174 '{}': ()
 341             191..192 'v': [u8; 3]
 342             203..261 '{     ...v {} }': ()
 343             209..233 'if let...[S] {}': ()
 344             212..230 'let b"... &v[S]': bool
 345             216..222 'b"foo"': &[u8]
 346             216..222 'b"foo"': &[u8]
 347             225..230 '&v[S]': &[u8]
 348             226..227 'v': [u8; 3]
 349             226..230 'v[S]': [u8]
 350             228..229 'S': S
 351             231..233 '{}': ()
 352             238..259 'if let... &v {}': ()
 353             241..256 'let b"foo" = &v': bool
 354             245..251 'b"foo"': &[u8; 3]
 355             245..251 'b"foo"': &[u8; 3]
 356             254..256 '&v': &[u8; 3]
 357             255..256 'v': [u8; 3]
 358             257..259 '{}': ()
 359         "#]],
 360     );
 361 }
 362
 363 #[test]
 364 fn infer_pattern_match_or() {
 365     check_infer_with_mismatches(
 366         r#"
 367         fn test() {
 368             let s: &str = "hello";
 369             match s {
 370                 "hello" | "world" => {}
 371                 _ => {}
 372             }
 373         }
 374         "#,
 375         expect![[r#"
 376             10..108 '{     ...   } }': ()
 377             20..21 's': &str
 378             30..37 '"hello"': &str
 379             43..106 'match ...     }': ()
 380             49..50 's': &str
 381             61..68 '"hello"': &str
 382             61..68 '"hello"': &str
 383             61..78 '"hello...world"': &str
 384             71..78 '"world"': &str
 385             71..78 '"world"': &str
 386             82..84 '{}': ()
 387             93..94 '_': &str
 388             98..100 '{}': ()
 389         "#]],
 390     );
 391 }
 392
 393 #[test]
 394 fn infer_pattern_match_arr() {
 395     check_infer(
 396         r#"
 397         fn test() {
 398             let arr: [f64; 2] = [0.0, 1.0];
 399             match arr {
 400                 [1.0, a] => {
 401                     a;
 402                 },
 403                 [b, c] => {
 404                     b;
 405                     c;
 406                 }
 407             }
 408         }
 409         "#,
 410         expect![[r#"
 411             10..179 '{     ...   } }': ()
 412             20..23 'arr': [f64; 2]
 413             36..46 '[0.0, 1.0]': [f64; 2]
 414             37..40 '0.0': f64
 415             42..45 '1.0': f64
 416             52..177 'match ...     }': ()
 417             58..61 'arr': [f64; 2]
 418             72..80 '[1.0, a]': [f64; 2]
 419             73..76 '1.0': f64
 420             73..76 '1.0': f64
 421             78..79 'a': f64
 422             84..110 '{     ...     }': ()
 423             98..99 'a': f64
 424             120..126 '[b, c]': [f64; 2]
 425             121..122 'b': f64
 426             124..125 'c': f64
 427             130..171 '{     ...     }': ()
 428             144..145 'b': f64
 429             159..160 'c': f64
 430         "#]],
 431     );
 432 }
 433
 434 #[test]
 435 fn infer_adt_pattern() {
 436     check_infer(
 437         r#"
 438         enum E {
 439             A { x: usize },
 440             B
 441         }
 442
 443         struct S(u32, E);
 444
 445         fn test() {
 446             let e = E::A { x: 3 };
 447
 448             let S(y, z) = foo;
 449             let E::A { x: new_var } = e;
 450
 451             match e {
 452                 E::A { x } => x,
 453                 E::B if foo => 1,
 454                 E::B => 10,
 455             };
 456
 457             let ref d @ E::A { .. } = e;
 458             d;
 459         }
 460         "#,
 461         expect![[r#"
 462             67..288 '{     ...  d; }': ()
 463             77..78 'e': E
 464             81..94 'E::A { x: 3 }': E
 465             91..92 '3': usize
 466             105..112 'S(y, z)': S
 467             107..108 'y': u32
 468             110..111 'z': E
 469             115..118 'foo': S
 470             128..147 'E::A {..._var }': E
 471             138..145 'new_var': usize
 472             150..151 'e': E
 473             158..244 'match ...     }': usize
 474             164..165 'e': E
 475             176..186 'E::A { x }': E
 476             183..184 'x': usize
 477             190..191 'x': usize
 478             201..205 'E::B': E
 479             209..212 'foo': bool
 480             216..217 '1': usize
 481             227..231 'E::B': E
 482             235..237 '10': usize
 483             255..274 'ref d ...{ .. }': &E
 484             263..274 'E::A { .. }': E
 485             277..278 'e': E
 486             284..285 'd': &E
 487         "#]],
 488     );
 489 }
 490
 491 #[test]
 492 fn tuple_struct_destructured_with_self() {
 493     check_infer(
 494         r#"
 495 struct Foo(usize,);
 496 impl Foo {
 497     fn f() {
 498         let Self(s,) = &Foo(0,);
 499         let Self(s,) = &mut Foo(0,);
 500         let Self(s,) = Foo(0,);
 501     }
 502 }
 503         "#,
 504         expect![[r#"
 505             42..151 '{     ...     }': ()
 506             56..64 'Self(s,)': Foo
 507             61..62 's': &usize
 508             67..75 '&Foo(0,)': &Foo
 509             68..71 'Foo': Foo(usize) -> Foo
 510             68..75 'Foo(0,)': Foo
 511             72..73 '0': usize
 512             89..97 'Self(s,)': Foo
 513             94..95 's': &mut usize
 514             100..112 '&mut Foo(0,)': &mut Foo
 515             105..108 'Foo': Foo(usize) -> Foo
 516             105..112 'Foo(0,)': Foo
 517             109..110 '0': usize
 518             126..134 'Self(s,)': Foo
 519             131..132 's': usize
 520             137..140 'Foo': Foo(usize) -> Foo
 521             137..144 'Foo(0,)': Foo
 522             141..142 '0': usize
 523         "#]],
 524     );
 525 }
 526
 527 #[test]
 528 fn enum_variant_through_self_in_pattern() {
 529     check_infer(
 530         r#"
 531         enum E {
 532             A { x: usize },
 533             B(usize),
 534             C
 535         }
 536
 537         impl E {
 538             fn test() {
 539                 match (loop {}) {
 540                     Self::A { x } => { x; },
 541                     Self::B(x) => { x; },
 542                     Self::C => {},
 543                 };
 544             }
 545         }
 546         "#,
 547         expect![[r#"
 548             75..217 '{     ...     }': ()
 549             85..210 'match ...     }': ()
 550             92..99 'loop {}': !
 551             97..99 '{}': ()
 552             115..128 'Self::A { x }': E
 553             125..126 'x': usize
 554             132..138 '{ x; }': ()
 555             134..135 'x': usize
 556             152..162 'Self::B(x)': E
 557             160..161 'x': usize
 558             166..172 '{ x; }': ()
 559             168..169 'x': usize
 560             186..193 'Self::C': E
 561             197..199 '{}': ()
 562         "#]],
 563     );
 564 }
 565
 566 #[test]
 567 fn infer_generics_in_patterns() {
 568     check_infer(
 569         r#"
 570         struct A<T> {
 571             x: T,
 572         }
 573
 574         enum Option<T> {
 575             Some(T),
 576             None,
 577         }
 578
 579         fn test(a1: A<u32>, o: Option<u64>) {
 580             let A { x: x2 } = a1;
 581             let A::<i64> { x: x3 } = A { x: 1 };
 582             match o {
 583                 Option::Some(t) => t,
 584                 _ => 1,
 585             };
 586         }
 587         "#,
 588         expect![[r#"
 589             78..80 'a1': A<u32>
 590             90..91 'o': Option<u64>
 591             106..243 '{     ...  }; }': ()
 592             116..127 'A { x: x2 }': A<u32>
 593             123..125 'x2': u32
 594             130..132 'a1': A<u32>
 595             142..160 'A::<i6...: x3 }': A<i64>
 596             156..158 'x3': i64
 597             163..173 'A { x: 1 }': A<i64>
 598             170..171 '1': i64
 599             179..240 'match ...     }': u64
 600             185..186 'o': Option<u64>
 601             197..212 'Option::Some(t)': Option<u64>
 602             210..211 't': u64
 603             216..217 't': u64
 604             227..228 '_': Option<u64>
 605             232..233 '1': u64
 606         "#]],
 607     );
 608 }
 609
 610 #[test]
 611 fn infer_const_pattern() {
 612     check(
 613         r#"
 614 enum Option<T> { None }
 615 use Option::None;
 616 struct Foo;
 617 const Bar: usize = 1;
 618
 619 fn test() {
 620     let a: Option<u32> = None;
 621     let b: Option<i64> = match a {
 622         None => None,
 623     };
 624     let _: () = match () { Foo => () };
 625                         // ^^^ expected (), got Foo
 626     let _: () = match () { Bar => () };
 627                         // ^^^ expected (), got usize
 628 }
 629         "#,
 630     );
 631 }
 632
 633 #[test]
 634 fn infer_guard() {
 635     check_infer(
 636         r#"
 637 struct S;
 638 impl S { fn foo(&self) -> bool { false } }
 639
 640 fn main() {
 641     match S {
 642         s if s.foo() => (),
 643     }
 644 }
 645         "#,
 646         expect![[r#"
 647             27..31 'self': &S
 648             41..50 '{ false }': bool
 649             43..48 'false': bool
 650             64..115 '{     ...   } }': ()
 651             70..113 'match ...     }': ()
 652             76..77 'S': S
 653             88..89 's': S
 654             93..94 's': S
 655             93..100 's.foo()': bool
 656             104..106 '()': ()
 657     "#]],
 658     )
 659 }
 660
 661 #[test]
 662 fn match_ergonomics_in_closure_params() {
 663     check_infer(
 664         r#"
 665 //- minicore: fn
 666 fn foo<T, U, F: FnOnce(T) -> U>(t: T, f: F) -> U { loop {} }
 667
 668 fn test() {
 669     foo(&(1, "a"), |&(x, y)| x); // normal, no match ergonomics
 670     foo(&(1, "a"), |(x, y)| x);
 671 }
 672 "#,
 673         expect![[r#"
 674             32..33 't': T
 675             38..39 'f': F
 676             49..60 '{ loop {} }': U
 677             51..58 'loop {}': !
 678             56..58 '{}': ()
 679             72..171 '{     ... x); }': ()
 680             78..81 'foo': fn foo<&(i32, &str), i32, |&(i32, &str)| -> i32>(&(i32, &str), |&(i32, &str)| -> i32) -> i32
 681             78..105 'foo(&(...y)| x)': i32
 682             82..91 '&(1, "a")': &(i32, &str)
 683             83..91 '(1, "a")': (i32, &str)
 684             84..85 '1': i32
 685             87..90 '"a"': &str
 686             93..104 '|&(x, y)| x': |&(i32, &str)| -> i32
 687             94..101 '&(x, y)': &(i32, &str)
 688             95..101 '(x, y)': (i32, &str)
 689             96..97 'x': i32
 690             99..100 'y': &str
 691             103..104 'x': i32
 692             142..145 'foo': fn foo<&(i32, &str), &i32, |&(i32, &str)| -> &i32>(&(i32, &str), |&(i32, &str)| -> &i32) -> &i32
 693             142..168 'foo(&(...y)| x)': &i32
 694             146..155 '&(1, "a")': &(i32, &str)
 695             147..155 '(1, "a")': (i32, &str)
 696             148..149 '1': i32
 697             151..154 '"a"': &str
 698             157..167 '|(x, y)| x': |&(i32, &str)| -> &i32
 699             158..164 '(x, y)': (i32, &str)
 700             159..160 'x': &i32
 701             162..163 'y': &&str
 702             166..167 'x': &i32
 703         "#]],
 704     );
 705 }
 706
 707 #[test]
 708 fn slice_tail_pattern() {
 709     check_infer(
 710         r#"
 711         fn foo(params: &[i32]) {
 712             match params {
 713                 [head, tail @ ..] => {
 714                 }
 715             }
 716         }
 717         "#,
 718         expect![[r#"
 719             7..13 'params': &[i32]
 720             23..92 '{     ...   } }': ()
 721             29..90 'match ...     }': ()
 722             35..41 'params': &[i32]
 723             52..69 '[head,... @ ..]': [i32]
 724             53..57 'head': &i32
 725             59..68 'tail @ ..': &[i32]
 726             66..68 '..': [i32]
 727             73..84 '{         }': ()
 728         "#]],
 729     );
 730 }
 731
 732 #[test]
 733 fn box_pattern() {
 734     check_infer(
 735         r#"
 736         pub struct Global;
 737         #[lang = "owned_box"]
 738         pub struct Box<T, A = Global>(T);
 739
 740         fn foo(params: Box<i32>) {
 741             match params {
 742                 box integer => {}
 743             }
 744         }
 745         "#,
 746         expect![[r#"
 747             83..89 'params': Box<i32, Global>
 748             101..155 '{     ...   } }': ()
 749             107..153 'match ...     }': ()
 750             113..119 'params': Box<i32, Global>
 751             130..141 'box integer': Box<i32, Global>
 752             134..141 'integer': i32
 753             145..147 '{}': ()
 754         "#]],
 755     );
 756     check_infer(
 757         r#"
 758         #[lang = "owned_box"]
 759         pub struct Box<T>(T);
 760
 761         fn foo(params: Box<i32>) {
 762             match params {
 763                 box integer => {}
 764             }
 765         }
 766         "#,
 767         expect![[r#"
 768             52..58 'params': Box<i32>
 769             70..124 '{     ...   } }': ()
 770             76..122 'match ...     }': ()
 771             82..88 'params': Box<i32>
 772             99..110 'box integer': Box<i32>
 773             103..110 'integer': i32
 774             114..116 '{}': ()
 775         "#]],
 776     );
 777 }
 778
 779 #[test]
 780 fn tuple_ellipsis_pattern() {
 781     check_infer_with_mismatches(
 782         r#"
 783 fn foo(tuple: (u8, i16, f32)) {
 784     match tuple {
 785         (.., b, c) => {},
 786         (a, .., c) => {},
 787         (a, b, ..) => {},
 788         (a, b) => {/*too short*/}
 789         (a, b, c, d) => {/*too long*/}
 790         _ => {}
 791     }
 792 }"#,
 793         expect![[r#"
 794             7..12 'tuple': (u8, i16, f32)
 795             30..224 '{     ...   } }': ()
 796             36..222 'match ...     }': ()
 797             42..47 'tuple': (u8, i16, f32)
 798             58..68 '(.., b, c)': (u8, i16, f32)
 799             63..64 'b': i16
 800             66..67 'c': f32
 801             72..74 '{}': ()
 802             84..94 '(a, .., c)': (u8, i16, f32)
 803             85..86 'a': u8
 804             92..93 'c': f32
 805             98..100 '{}': ()
 806             110..120 '(a, b, ..)': (u8, i16, f32)
 807             111..112 'a': u8
 808             114..115 'b': i16
 809             124..126 '{}': ()
 810             136..142 '(a, b)': (u8, i16)
 811             137..138 'a': u8
 812             140..141 'b': i16
 813             146..161 '{/*too short*/}': ()
 814             170..182 '(a, b, c, d)': (u8, i16, f32, {unknown})
 815             171..172 'a': u8
 816             174..175 'b': i16
 817             177..178 'c': f32
 818             180..181 'd': {unknown}
 819             186..200 '{/*too long*/}': ()
 820             209..210 '_': (u8, i16, f32)
 821             214..216 '{}': ()
 822             136..142: expected (u8, i16, f32), got (u8, i16)
 823             170..182: expected (u8, i16, f32), got (u8, i16, f32, {unknown})
 824         "#]],
 825     );
 826 }
 827
 828 #[test]
 829 fn tuple_struct_ellipsis_pattern() {
 830     check_infer(
 831         r#"
 832 struct Tuple(u8, i16, f32);
 833 fn foo(tuple: Tuple) {
 834     match tuple {
 835         Tuple(.., b, c) => {},
 836         Tuple(a, .., c) => {},
 837         Tuple(a, b, ..) => {},
 838         Tuple(a, b) => {/*too short*/}
 839         Tuple(a, b, c, d) => {/*too long*/}
 840         _ => {}
 841     }
 842 }"#,
 843         expect![[r#"
 844             35..40 'tuple': Tuple
 845             49..268 '{     ...   } }': ()
 846             55..266 'match ...     }': ()
 847             61..66 'tuple': Tuple
 848             77..92 'Tuple(.., b, c)': Tuple
 849             87..88 'b': i16
 850             90..91 'c': f32
 851             96..98 '{}': ()
 852             108..123 'Tuple(a, .., c)': Tuple
 853             114..115 'a': u8
 854             121..122 'c': f32
 855             127..129 '{}': ()
 856             139..154 'Tuple(a, b, ..)': Tuple
 857             145..146 'a': u8
 858             148..149 'b': i16
 859             158..160 '{}': ()
 860             170..181 'Tuple(a, b)': Tuple
 861             176..177 'a': u8
 862             179..180 'b': i16
 863             185..200 '{/*too short*/}': ()
 864             209..226 'Tuple(... c, d)': Tuple
 865             215..216 'a': u8
 866             218..219 'b': i16
 867             221..222 'c': f32
 868             224..225 'd': {unknown}
 869             230..244 '{/*too long*/}': ()
 870             253..254 '_': Tuple
 871             258..260 '{}': ()
 872         "#]],
 873     );
 874 }
 875
 876 #[test]
 877 fn const_block_pattern() {
 878     check_infer(
 879         r#"
 880 struct Foo(usize);
 881 fn foo(foo: Foo) {
 882     match foo {
 883         const { Foo(15 + 32) } => {},
 884         _ => {}
 885     }
 886 }"#,
 887         expect![[r#"
 888             26..29 'foo': Foo
 889             36..115 '{     ...   } }': ()
 890             42..113 'match ...     }': ()
 891             48..51 'foo': Foo
 892             62..84 'const ... 32) }': Foo
 893             68..84 '{ Foo(... 32) }': Foo
 894             70..73 'Foo': Foo(usize) -> Foo
 895             70..82 'Foo(15 + 32)': Foo
 896             74..76 '15': usize
 897             74..81 '15 + 32': usize
 898             79..81 '32': usize
 899             88..90 '{}': ()
 900             100..101 '_': Foo
 901             105..107 '{}': ()
 902         "#]],
 903     );
 904 }
 905
 906 #[test]
 907 fn macro_pat() {
 908     check_types(
 909         r#"
 910 macro_rules! pat {
 911     ($name:ident) => { Enum::Variant1($name) }
 912 }
 913
 914 enum Enum {
 915     Variant1(u8),
 916     Variant2,
 917 }
 918
 919 fn f(e: Enum) {
 920     match e {
 921         pat!(bind) => {
 922             bind;
 923           //^^^^ u8
 924         }
 925         Enum::Variant2 => {}
 926     }
 927 }
 928     "#,
 929     )
 930 }
 931
 932 #[test]
 933 fn type_mismatch_in_or_pattern() {
 934     check_infer_with_mismatches(
 935         r#"
 936 fn main() {
 937     match (false,) {
 938         (true | (),) => {}
 939         (() | true,) => {}
 940         (_ | (),) => {}
 941         (() | _,) => {}
 942     }
 943 }
 944 "#,
 945         expect![[r#"
 946             10..142 '{     ...   } }': ()
 947             16..140 'match ...     }': ()
 948             22..30 '(false,)': (bool,)
 949             23..28 'false': bool
 950             41..53 '(true | (),)': (bool,)
 951             42..46 'true': bool
 952             42..46 'true': bool
 953             42..51 'true | ()': bool
 954             49..51 '()': ()
 955             57..59 '{}': ()
 956             68..80 '(() | true,)': ((),)
 957             69..71 '()': ()
 958             69..78 '() | true': ()
 959             74..78 'true': bool
 960             74..78 'true': bool
 961             84..86 '{}': ()
 962             95..104 '(_ | (),)': (bool,)
 963             96..97 '_': bool
 964             96..102 '_ | ()': bool
 965             100..102 '()': ()
 966             108..110 '{}': ()
 967             119..128 '(() | _,)': ((),)
 968             120..122 '()': ()
 969             120..126 '() | _': ()
 970             125..126 '_': bool
 971             132..134 '{}': ()
 972             49..51: expected bool, got ()
 973             68..80: expected (bool,), got ((),)
 974             69..71: expected bool, got ()
 975             69..78: expected bool, got ()
 976             100..102: expected bool, got ()
 977             119..128: expected (bool,), got ((),)
 978             120..122: expected bool, got ()
 979             120..126: expected bool, got ()
 980         "#]],
 981     );
 982 }
 983
 984 #[test]
 985 fn slice_pattern_correctly_handles_array_length() {
 986     check_infer(
 987         r#"
 988 fn main() {
 989     let [head, middle @ .., tail, tail2] = [1, 2, 3, 4, 5];
 990 }
 991     "#,
 992         expect![[r#"
 993             10..73 '{     ... 5]; }': ()
 994             20..52 '[head,...tail2]': [i32; 5]
 995             21..25 'head': i32
 996             27..38 'middle @ ..': [i32; 2]
 997             36..38 '..': [i32; 2]
 998             40..44 'tail': i32
 999             46..51 'tail2': i32
1000             55..70 '[1, 2, 3, 4, 5]': [i32; 5]
1001             56..57 '1': i32
1002             59..60 '2': i32
1003             62..63 '3': i32
1004             65..66 '4': i32
1005             68..69 '5': i32
1006         "#]],
1007     );
1008 }
1009
1010 #[test]
1011 fn pattern_lookup_in_value_ns() {
1012     check_types(
1013         r#"
1014 use self::Constructor::*;
1015 struct IntRange {
1016     range: (),
1017 }
1018 enum Constructor {
1019     IntRange(IntRange),
1020 }
1021 fn main() {
1022     match Constructor::IntRange(IntRange { range: () }) {
1023         IntRange(x) => {
1024             x;
1025           //^ IntRange
1026         }
1027         Constructor::IntRange(x) => {
1028             x;
1029           //^ IntRange
1030         }
1031     }
1032 }
1033     "#,
1034     );
1035 }
1036
1037 #[test]
1038 fn if_let_guards() {
1039     check_types(
1040         r#"
1041 fn main() {
1042     match (0,) {
1043         opt if let (x,) = opt => {
1044             x;
1045           //^ i32
1046         }
1047         _ => {}
1048     }
1049 }
1050     "#,
1051     );
1052 }
1053
1054 #[test]
1055 fn tuple_wildcard() {
1056     check_types(
1057         r#"
1058 fn main() {
1059     enum Option<T> {Some(T), None}
1060     use Option::*;
1061
1062     let mut x = None;
1063     x;
1064   //^ Option<(i32, i32)>
1065
1066     if let Some((_, _a)) = x {}
1067
1068     x = Some((1, 2));
1069 }
1070         "#,
1071     );
1072 }
1073
1074 #[test]
1075 fn cfg_params() {
1076     check_types(
1077         r#"
1078 fn my_fn(#[cfg(feature = "feature")] u8: u8, u32: u32) {}
1079                                            //^^^ u32
1080 "#,
1081     );
1082 }