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-rw-r--r--crates/hir_ty/src/tests/traits.rs1354
1 files changed, 656 insertions, 698 deletions
diff --git a/crates/hir_ty/src/tests/traits.rs b/crates/hir_ty/src/tests/traits.rs
index 1879dbc78..ffc7c8ef4 100644
--- a/crates/hir_ty/src/tests/traits.rs
+++ b/crates/hir_ty/src/tests/traits.rs
@@ -263,15 +263,14 @@ mod ops {
263fn infer_from_bound_1() { 263fn infer_from_bound_1() {
264 check_infer( 264 check_infer(
265 r#" 265 r#"
266 trait Trait<T> {} 266trait Trait<T> {}
267 struct S<T>(T); 267struct S<T>(T);
268 impl<U> Trait<U> for S<U> {} 268impl<U> Trait<U> for S<U> {}
269 fn foo<T: Trait<u32>>(t: T) {} 269fn foo<T: Trait<u32>>(t: T) {}
270 fn test() { 270fn test() {
271 let s = S(unknown); 271 let s = S(unknown);
272 foo(s); 272 foo(s);
273 } 273}"#,
274 "#,
275 expect![[r#" 274 expect![[r#"
276 85..86 't': T 275 85..86 't': T
277 91..93 '{}': () 276 91..93 '{}': ()
@@ -291,15 +290,14 @@ fn infer_from_bound_1() {
291fn infer_from_bound_2() { 290fn infer_from_bound_2() {
292 check_infer( 291 check_infer(
293 r#" 292 r#"
294 trait Trait<T> {} 293trait Trait<T> {}
295 struct S<T>(T); 294struct S<T>(T);
296 impl<U> Trait<U> for S<U> {} 295impl<U> Trait<U> for S<U> {}
297 fn foo<U, T: Trait<U>>(t: T) -> U {} 296fn foo<U, T: Trait<U>>(t: T) -> U {}
298 fn test() { 297fn test() {
299 let s = S(unknown); 298 let s = S(unknown);
300 let x: u32 = foo(s); 299 let x: u32 = foo(s);
301 } 300}"#,
302 "#,
303 expect![[r#" 301 expect![[r#"
304 86..87 't': T 302 86..87 't': T
305 97..99 '{}': () 303 97..99 '{}': ()
@@ -321,13 +319,12 @@ fn trait_default_method_self_bound_implements_trait() {
321 cov_mark::check!(trait_self_implements_self); 319 cov_mark::check!(trait_self_implements_self);
322 check_infer( 320 check_infer(
323 r#" 321 r#"
324 trait Trait { 322trait Trait {
325 fn foo(&self) -> i64; 323 fn foo(&self) -> i64;
326 fn bar(&self) -> { 324 fn bar(&self) -> {
327 let x = self.foo(); 325 let x = self.foo();
328 } 326 }
329 } 327}"#,
330 "#,
331 expect![[r#" 328 expect![[r#"
332 26..30 'self': &Self 329 26..30 'self': &Self
333 52..56 'self': &Self 330 52..56 'self': &Self
@@ -343,15 +340,14 @@ fn trait_default_method_self_bound_implements_trait() {
343fn trait_default_method_self_bound_implements_super_trait() { 340fn trait_default_method_self_bound_implements_super_trait() {
344 check_infer( 341 check_infer(
345 r#" 342 r#"
346 trait SuperTrait { 343trait SuperTrait {
347 fn foo(&self) -> i64; 344 fn foo(&self) -> i64;
348 } 345}
349 trait Trait: SuperTrait { 346trait Trait: SuperTrait {
350 fn bar(&self) -> { 347 fn bar(&self) -> {
351 let x = self.foo(); 348 let x = self.foo();
352 } 349 }
353 } 350}"#,
354 "#,
355 expect![[r#" 351 expect![[r#"
356 31..35 'self': &Self 352 31..35 'self': &Self
357 85..89 'self': &Self 353 85..89 'self': &Self
@@ -367,18 +363,17 @@ fn trait_default_method_self_bound_implements_super_trait() {
367fn infer_project_associated_type() { 363fn infer_project_associated_type() {
368 check_infer( 364 check_infer(
369 r#" 365 r#"
370 trait Iterable { 366trait Iterable {
371 type Item; 367 type Item;
372 } 368}
373 struct S; 369struct S;
374 impl Iterable for S { type Item = u32; } 370impl Iterable for S { type Item = u32; }
375 fn test<T: Iterable>() { 371fn test<T: Iterable>() {
376 let x: <S as Iterable>::Item = 1; 372 let x: <S as Iterable>::Item = 1;
377 let y: <T as Iterable>::Item = no_matter; 373 let y: <T as Iterable>::Item = no_matter;
378 let z: T::Item = no_matter; 374 let z: T::Item = no_matter;
379 let a: <T>::Item = no_matter; 375 let a: <T>::Item = no_matter;
380 } 376}"#,
381 "#,
382 expect![[r#" 377 expect![[r#"
383 108..261 '{ ...ter; }': () 378 108..261 '{ ...ter; }': ()
384 118..119 'x': u32 379 118..119 'x': u32
@@ -397,20 +392,19 @@ fn infer_project_associated_type() {
397fn infer_return_associated_type() { 392fn infer_return_associated_type() {
398 check_infer( 393 check_infer(
399 r#" 394 r#"
400 trait Iterable { 395trait Iterable {
401 type Item; 396 type Item;
402 } 397}
403 struct S; 398struct S;
404 impl Iterable for S { type Item = u32; } 399impl Iterable for S { type Item = u32; }
405 fn foo1<T: Iterable>(t: T) -> T::Item {} 400fn foo1<T: Iterable>(t: T) -> T::Item {}
406 fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item {} 401fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item {}
407 fn foo3<T: Iterable>(t: T) -> <T>::Item {} 402fn foo3<T: Iterable>(t: T) -> <T>::Item {}
408 fn test() { 403fn test() {
409 let x = foo1(S); 404 let x = foo1(S);
410 let y = foo2(S); 405 let y = foo2(S);
411 let z = foo3(S); 406 let z = foo3(S);
412 } 407}"#,
413 "#,
414 expect![[r#" 408 expect![[r#"
415 106..107 't': T 409 106..107 't': T
416 123..125 '{}': () 410 123..125 '{}': ()
@@ -439,13 +433,12 @@ fn infer_return_associated_type() {
439fn infer_associated_type_bound() { 433fn infer_associated_type_bound() {
440 check_infer( 434 check_infer(
441 r#" 435 r#"
442 trait Iterable { 436trait Iterable {
443 type Item; 437 type Item;
444 } 438}
445 fn test<T: Iterable<Item=u32>>() { 439fn test<T: Iterable<Item=u32>>() {
446 let y: T::Item = unknown; 440 let y: T::Item = unknown;
447 } 441}"#,
448 "#,
449 expect![[r#" 442 expect![[r#"
450 67..100 '{ ...own; }': () 443 67..100 '{ ...own; }': ()
451 77..78 'y': u32 444 77..78 'y': u32
@@ -458,9 +451,8 @@ fn infer_associated_type_bound() {
458fn infer_const_body() { 451fn infer_const_body() {
459 check_infer( 452 check_infer(
460 r#" 453 r#"
461 const A: u32 = 1 + 1; 454const A: u32 = 1 + 1;
462 static B: u64 = { let x = 1; x }; 455static B: u64 = { let x = 1; x };"#,
463 "#,
464 expect![[r#" 456 expect![[r#"
465 15..16 '1': u32 457 15..16 '1': u32
466 15..20 '1 + 1': u32 458 15..20 '1 + 1': u32
@@ -477,13 +469,12 @@ fn infer_const_body() {
477fn tuple_struct_fields() { 469fn tuple_struct_fields() {
478 check_infer( 470 check_infer(
479 r#" 471 r#"
480 struct S(i32, u64); 472struct S(i32, u64);
481 fn test() -> u64 { 473fn test() -> u64 {
482 let a = S(4, 6); 474 let a = S(4, 6);
483 let b = a.0; 475 let b = a.0;
484 a.1 476 a.1
485 } 477}"#,
486 "#,
487 expect![[r#" 478 expect![[r#"
488 37..86 '{ ... a.1 }': u64 479 37..86 '{ ... a.1 }': u64
489 47..48 'a': S 480 47..48 'a': S
@@ -504,13 +495,12 @@ fn tuple_struct_fields() {
504fn tuple_struct_with_fn() { 495fn tuple_struct_with_fn() {
505 check_infer( 496 check_infer(
506 r#" 497 r#"
507 struct S(fn(u32) -> u64); 498struct S(fn(u32) -> u64);
508 fn test() -> u64 { 499fn test() -> u64 {
509 let a = S(|i| 2*i); 500 let a = S(|i| 2*i);
510 let b = a.0(4); 501 let b = a.0(4);
511 a.0(2) 502 a.0(2)
512 } 503}"#,
513 "#,
514 expect![[r#" 504 expect![[r#"
515 43..101 '{ ...0(2) }': u64 505 43..101 '{ ...0(2) }': u64
516 53..54 'a': S 506 53..54 'a': S
@@ -949,27 +939,26 @@ fn test<T: ApplyL>(t: T) {
949fn argument_impl_trait() { 939fn argument_impl_trait() {
950 check_infer_with_mismatches( 940 check_infer_with_mismatches(
951 r#" 941 r#"
952 trait Trait<T> { 942trait Trait<T> {
953 fn foo(&self) -> T; 943 fn foo(&self) -> T;
954 fn foo2(&self) -> i64; 944 fn foo2(&self) -> i64;
955 } 945}
956 fn bar(x: impl Trait<u16>) {} 946fn bar(x: impl Trait<u16>) {}
957 struct S<T>(T); 947struct S<T>(T);
958 impl<T> Trait<T> for S<T> {} 948impl<T> Trait<T> for S<T> {}
959 949
960 fn test(x: impl Trait<u64>, y: &impl Trait<u32>) { 950fn test(x: impl Trait<u64>, y: &impl Trait<u32>) {
961 x; 951 x;
962 y; 952 y;
963 let z = S(1); 953 let z = S(1);
964 bar(z); 954 bar(z);
965 x.foo(); 955 x.foo();
966 y.foo(); 956 y.foo();
967 z.foo(); 957 z.foo();
968 x.foo2(); 958 x.foo2();
969 y.foo2(); 959 y.foo2();
970 z.foo2(); 960 z.foo2();
971 } 961}"#,
972 "#,
973 expect![[r#" 962 expect![[r#"
974 29..33 'self': &Self 963 29..33 'self': &Self
975 54..58 'self': &Self 964 54..58 'self': &Self
@@ -1007,30 +996,29 @@ fn argument_impl_trait() {
1007fn argument_impl_trait_type_args_1() { 996fn argument_impl_trait_type_args_1() {
1008 check_infer_with_mismatches( 997 check_infer_with_mismatches(
1009 r#" 998 r#"
1010 trait Trait {} 999trait Trait {}
1011 trait Foo { 1000trait Foo {
1012 // this function has an implicit Self param, an explicit type param, 1001 // this function has an implicit Self param, an explicit type param,
1013 // and an implicit impl Trait param! 1002 // and an implicit impl Trait param!
1014 fn bar<T>(x: impl Trait) -> T { loop {} } 1003 fn bar<T>(x: impl Trait) -> T { loop {} }
1015 } 1004}
1016 fn foo<T>(x: impl Trait) -> T { loop {} } 1005fn foo<T>(x: impl Trait) -> T { loop {} }
1017 struct S; 1006struct S;
1018 impl Trait for S {} 1007impl Trait for S {}
1019 struct F; 1008struct F;
1020 impl Foo for F {} 1009impl Foo for F {}
1021 1010
1022 fn test() { 1011fn test() {
1023 Foo::bar(S); 1012 Foo::bar(S);
1024 <F as Foo>::bar(S); 1013 <F as Foo>::bar(S);
1025 F::bar(S); 1014 F::bar(S);
1026 Foo::bar::<u32>(S); 1015 Foo::bar::<u32>(S);
1027 <F as Foo>::bar::<u32>(S); 1016 <F as Foo>::bar::<u32>(S);
1028 1017
1029 foo(S); 1018 foo(S);
1030 foo::<u32>(S); 1019 foo::<u32>(S);
1031 foo::<u32, i32>(S); // we should ignore the extraneous i32 1020 foo::<u32, i32>(S); // we should ignore the extraneous i32
1032 } 1021}"#,
1033 "#,
1034 expect![[r#" 1022 expect![[r#"
1035 155..156 'x': impl Trait 1023 155..156 'x': impl Trait
1036 175..186 '{ loop {} }': T 1024 175..186 '{ loop {} }': T
@@ -1073,21 +1061,20 @@ fn argument_impl_trait_type_args_1() {
1073fn argument_impl_trait_type_args_2() { 1061fn argument_impl_trait_type_args_2() {
1074 check_infer_with_mismatches( 1062 check_infer_with_mismatches(
1075 r#" 1063 r#"
1076 trait Trait {} 1064trait Trait {}
1077 struct S; 1065struct S;
1078 impl Trait for S {} 1066impl Trait for S {}
1079 struct F<T>; 1067struct F<T>;
1080 impl<T> F<T> { 1068impl<T> F<T> {
1081 fn foo<U>(self, x: impl Trait) -> (T, U) { loop {} } 1069 fn foo<U>(self, x: impl Trait) -> (T, U) { loop {} }
1082 } 1070}
1083 1071
1084 fn test() { 1072fn test() {
1085 F.foo(S); 1073 F.foo(S);
1086 F::<u32>.foo(S); 1074 F::<u32>.foo(S);
1087 F::<u32>.foo::<i32>(S); 1075 F::<u32>.foo::<i32>(S);
1088 F::<u32>.foo::<i32, u32>(S); // extraneous argument should be ignored 1076 F::<u32>.foo::<i32, u32>(S); // extraneous argument should be ignored
1089 } 1077}"#,
1090 "#,
1091 expect![[r#" 1078 expect![[r#"
1092 87..91 'self': F<T> 1079 87..91 'self': F<T>
1093 93..94 'x': impl Trait 1080 93..94 'x': impl Trait
@@ -1115,15 +1102,14 @@ fn argument_impl_trait_type_args_2() {
1115fn argument_impl_trait_to_fn_pointer() { 1102fn argument_impl_trait_to_fn_pointer() {
1116 check_infer_with_mismatches( 1103 check_infer_with_mismatches(
1117 r#" 1104 r#"
1118 trait Trait {} 1105trait Trait {}
1119 fn foo(x: impl Trait) { loop {} } 1106fn foo(x: impl Trait) { loop {} }
1120 struct S; 1107struct S;
1121 impl Trait for S {} 1108impl Trait for S {}
1122 1109
1123 fn test() { 1110fn test() {
1124 let f: fn(S) -> () = foo; 1111 let f: fn(S) -> () = foo;
1125 } 1112}"#,
1126 "#,
1127 expect![[r#" 1113 expect![[r#"
1128 22..23 'x': impl Trait 1114 22..23 'x': impl Trait
1129 37..48 '{ loop {} }': () 1115 37..48 '{ loop {} }': ()
@@ -1140,24 +1126,23 @@ fn argument_impl_trait_to_fn_pointer() {
1140fn impl_trait() { 1126fn impl_trait() {
1141 check_infer( 1127 check_infer(
1142 r#" 1128 r#"
1143 trait Trait<T> { 1129trait Trait<T> {
1144 fn foo(&self) -> T; 1130 fn foo(&self) -> T;
1145 fn foo2(&self) -> i64; 1131 fn foo2(&self) -> i64;
1146 } 1132}
1147 fn bar() -> impl Trait<u64> {} 1133fn bar() -> impl Trait<u64> {}
1148 1134
1149 fn test(x: impl Trait<u64>, y: &impl Trait<u64>) { 1135fn test(x: impl Trait<u64>, y: &impl Trait<u64>) {
1150 x; 1136 x;
1151 y; 1137 y;
1152 let z = bar(); 1138 let z = bar();
1153 x.foo(); 1139 x.foo();
1154 y.foo(); 1140 y.foo();
1155 z.foo(); 1141 z.foo();
1156 x.foo2(); 1142 x.foo2();
1157 y.foo2(); 1143 y.foo2();
1158 z.foo2(); 1144 z.foo2();
1159 } 1145}"#,
1160 "#,
1161 expect![[r#" 1146 expect![[r#"
1162 29..33 'self': &Self 1147 29..33 'self': &Self
1163 54..58 'self': &Self 1148 54..58 'self': &Self
@@ -1191,16 +1176,15 @@ fn simple_return_pos_impl_trait() {
1191 cov_mark::check!(lower_rpit); 1176 cov_mark::check!(lower_rpit);
1192 check_infer( 1177 check_infer(
1193 r#" 1178 r#"
1194 trait Trait<T> { 1179trait Trait<T> {
1195 fn foo(&self) -> T; 1180 fn foo(&self) -> T;
1196 } 1181}
1197 fn bar() -> impl Trait<u64> { loop {} } 1182fn bar() -> impl Trait<u64> { loop {} }
1198 1183
1199 fn test() { 1184fn test() {
1200 let a = bar(); 1185 let a = bar();
1201 a.foo(); 1186 a.foo();
1202 } 1187}"#,
1203 "#,
1204 expect![[r#" 1188 expect![[r#"
1205 29..33 'self': &Self 1189 29..33 'self': &Self
1206 71..82 '{ loop {} }': ! 1190 71..82 '{ loop {} }': !
@@ -1220,25 +1204,24 @@ fn simple_return_pos_impl_trait() {
1220fn more_return_pos_impl_trait() { 1204fn more_return_pos_impl_trait() {
1221 check_infer( 1205 check_infer(
1222 r#" 1206 r#"
1223 trait Iterator { 1207trait Iterator {
1224 type Item; 1208 type Item;
1225 fn next(&mut self) -> Self::Item; 1209 fn next(&mut self) -> Self::Item;
1226 } 1210}
1227 trait Trait<T> { 1211trait Trait<T> {
1228 fn foo(&self) -> T; 1212 fn foo(&self) -> T;
1229 } 1213}
1230 fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>) { loop {} } 1214fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>) { loop {} }
1231 fn baz<T>(t: T) -> (impl Iterator<Item = impl Trait<T>>, impl Trait<T>) { loop {} } 1215fn baz<T>(t: T) -> (impl Iterator<Item = impl Trait<T>>, impl Trait<T>) { loop {} }
1232 1216
1233 fn test() { 1217fn test() {
1234 let (a, b) = bar(); 1218 let (a, b) = bar();
1235 a.next().foo(); 1219 a.next().foo();
1236 b.foo(); 1220 b.foo();
1237 let (c, d) = baz(1u128); 1221 let (c, d) = baz(1u128);
1238 c.next().foo(); 1222 c.next().foo();
1239 d.foo(); 1223 d.foo();
1240 } 1224}"#,
1241 "#,
1242 expect![[r#" 1225 expect![[r#"
1243 49..53 'self': &mut Self 1226 49..53 'self': &mut Self
1244 101..105 'self': &Self 1227 101..105 'self': &Self
@@ -1279,24 +1262,23 @@ fn more_return_pos_impl_trait() {
1279fn dyn_trait() { 1262fn dyn_trait() {
1280 check_infer( 1263 check_infer(
1281 r#" 1264 r#"
1282 trait Trait<T> { 1265trait Trait<T> {
1283 fn foo(&self) -> T; 1266 fn foo(&self) -> T;
1284 fn foo2(&self) -> i64; 1267 fn foo2(&self) -> i64;
1285 } 1268}
1286 fn bar() -> dyn Trait<u64> {} 1269fn bar() -> dyn Trait<u64> {}
1287 1270
1288 fn test(x: dyn Trait<u64>, y: &dyn Trait<u64>) { 1271fn test(x: dyn Trait<u64>, y: &dyn Trait<u64>) {
1289 x; 1272 x;
1290 y; 1273 y;
1291 let z = bar(); 1274 let z = bar();
1292 x.foo(); 1275 x.foo();
1293 y.foo(); 1276 y.foo();
1294 z.foo(); 1277 z.foo();
1295 x.foo2(); 1278 x.foo2();
1296 y.foo2(); 1279 y.foo2();
1297 z.foo2(); 1280 z.foo2();
1298 } 1281}"#,
1299 "#,
1300 expect![[r#" 1282 expect![[r#"
1301 29..33 'self': &Self 1283 29..33 'self': &Self
1302 54..58 'self': &Self 1284 54..58 'self': &Self
@@ -1329,22 +1311,21 @@ fn dyn_trait() {
1329fn dyn_trait_in_impl() { 1311fn dyn_trait_in_impl() {
1330 check_infer( 1312 check_infer(
1331 r#" 1313 r#"
1332 trait Trait<T, U> { 1314trait Trait<T, U> {
1333 fn foo(&self) -> (T, U); 1315 fn foo(&self) -> (T, U);
1334 } 1316}
1335 struct S<T, U> {} 1317struct S<T, U> {}
1336 impl<T, U> S<T, U> { 1318impl<T, U> S<T, U> {
1337 fn bar(&self) -> &dyn Trait<T, U> { loop {} } 1319 fn bar(&self) -> &dyn Trait<T, U> { loop {} }
1338 } 1320}
1339 trait Trait2<T, U> { 1321trait Trait2<T, U> {
1340 fn baz(&self) -> (T, U); 1322 fn baz(&self) -> (T, U);
1341 } 1323}
1342 impl<T, U> Trait2<T, U> for dyn Trait<T, U> { } 1324impl<T, U> Trait2<T, U> for dyn Trait<T, U> { }
1343 1325
1344 fn test(s: S<u32, i32>) { 1326fn test(s: S<u32, i32>) {
1345 s.bar().baz(); 1327 s.bar().baz();
1346 } 1328}"#,
1347 "#,
1348 expect![[r#" 1329 expect![[r#"
1349 32..36 'self': &Self 1330 32..36 'self': &Self
1350 102..106 'self': &S<T, U> 1331 102..106 'self': &S<T, U>
@@ -1365,20 +1346,19 @@ fn dyn_trait_in_impl() {
1365fn dyn_trait_bare() { 1346fn dyn_trait_bare() {
1366 check_infer( 1347 check_infer(
1367 r#" 1348 r#"
1368 trait Trait { 1349trait Trait {
1369 fn foo(&self) -> u64; 1350 fn foo(&self) -> u64;
1370 } 1351}
1371 fn bar() -> Trait {} 1352fn bar() -> Trait {}
1372 1353
1373 fn test(x: Trait, y: &Trait) -> u64 { 1354fn test(x: Trait, y: &Trait) -> u64 {
1374 x; 1355 x;
1375 y; 1356 y;
1376 let z = bar(); 1357 let z = bar();
1377 x.foo(); 1358 x.foo();
1378 y.foo(); 1359 y.foo();
1379 z.foo(); 1360 z.foo();
1380 } 1361}"#,
1381 "#,
1382 expect![[r#" 1362 expect![[r#"
1383 26..30 'self': &Self 1363 26..30 'self': &Self
1384 60..62 '{}': () 1364 60..62 '{}': ()
@@ -1404,17 +1384,24 @@ fn dyn_trait_bare() {
1404fn weird_bounds() { 1384fn weird_bounds() {
1405 check_infer( 1385 check_infer(
1406 r#" 1386 r#"
1407 trait Trait {} 1387trait Trait {}
1408 fn test(a: impl Trait + 'lifetime, b: impl 'lifetime, c: impl (Trait), d: impl ('lifetime), e: impl ?Sized, f: impl Trait + ?Sized) {} 1388fn test(
1409 "#, 1389 a: impl Trait + 'lifetime,
1390 b: impl 'lifetime,
1391 c: impl (Trait),
1392 d: impl ('lifetime),
1393 e: impl ?Sized,
1394 f: impl Trait + ?Sized
1395) {}
1396"#,
1410 expect![[r#" 1397 expect![[r#"
1411 23..24 'a': impl Trait 1398 28..29 'a': impl Trait
1412 50..51 'b': impl 1399 59..60 'b': impl
1413 69..70 'c': impl Trait 1400 82..83 'c': impl Trait
1414 86..87 'd': impl 1401 103..104 'd': impl
1415 107..108 'e': impl 1402 128..129 'e': impl
1416 123..124 'f': impl Trait 1403 148..149 'f': impl Trait
1417 147..149 '{}': () 1404 173..175 '{}': ()
1418 "#]], 1405 "#]],
1419 ); 1406 );
1420} 1407}
@@ -1439,27 +1426,26 @@ fn test(x: (impl Trait + UnknownTrait)) {
1439fn assoc_type_bindings() { 1426fn assoc_type_bindings() {
1440 check_infer( 1427 check_infer(
1441 r#" 1428 r#"
1442 trait Trait { 1429trait Trait {
1443 type Type; 1430 type Type;
1444 } 1431}
1445 1432
1446 fn get<T: Trait>(t: T) -> <T as Trait>::Type {} 1433fn get<T: Trait>(t: T) -> <T as Trait>::Type {}
1447 fn get2<U, T: Trait<Type = U>>(t: T) -> U {} 1434fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
1448 fn set<T: Trait<Type = u64>>(t: T) -> T {t} 1435fn set<T: Trait<Type = u64>>(t: T) -> T {t}
1449 1436
1450 struct S<T>; 1437struct S<T>;
1451 impl<T> Trait for S<T> { type Type = T; } 1438impl<T> Trait for S<T> { type Type = T; }
1452 1439
1453 fn test<T: Trait<Type = u32>>(x: T, y: impl Trait<Type = i64>) { 1440fn test<T: Trait<Type = u32>>(x: T, y: impl Trait<Type = i64>) {
1454 get(x); 1441 get(x);
1455 get2(x); 1442 get2(x);
1456 get(y); 1443 get(y);
1457 get2(y); 1444 get2(y);
1458 get(set(S)); 1445 get(set(S));
1459 get2(set(S)); 1446 get2(set(S));
1460 get2(S::<str>); 1447 get2(S::<str>);
1461 } 1448}"#,
1462 "#,
1463 expect![[r#" 1449 expect![[r#"
1464 49..50 't': T 1450 49..50 't': T
1465 77..79 '{}': () 1451 77..79 '{}': ()
@@ -1546,18 +1532,17 @@ mod iter {
1546fn projection_eq_within_chalk() { 1532fn projection_eq_within_chalk() {
1547 check_infer( 1533 check_infer(
1548 r#" 1534 r#"
1549 trait Trait1 { 1535trait Trait1 {
1550 type Type; 1536 type Type;
1551 } 1537}
1552 trait Trait2<T> { 1538trait Trait2<T> {
1553 fn foo(self) -> T; 1539 fn foo(self) -> T;
1554 } 1540}
1555 impl<T, U> Trait2<T> for U where U: Trait1<Type = T> {} 1541impl<T, U> Trait2<T> for U where U: Trait1<Type = T> {}
1556 1542
1557 fn test<T: Trait1<Type = u32>>(x: T) { 1543fn test<T: Trait1<Type = u32>>(x: T) {
1558 x.foo(); 1544 x.foo();
1559 } 1545}"#,
1560 "#,
1561 expect![[r#" 1546 expect![[r#"
1562 61..65 'self': Self 1547 61..65 'self': Self
1563 163..164 'x': T 1548 163..164 'x': T
@@ -1589,19 +1574,18 @@ fn test<T: foo::Trait>(x: T) {
1589fn super_trait_method_resolution() { 1574fn super_trait_method_resolution() {
1590 check_infer( 1575 check_infer(
1591 r#" 1576 r#"
1592 mod foo { 1577mod foo {
1593 trait SuperTrait { 1578 trait SuperTrait {
1594 fn foo(&self) -> u32 {} 1579 fn foo(&self) -> u32 {}
1595 } 1580 }
1596 } 1581}
1597 trait Trait1: foo::SuperTrait {} 1582trait Trait1: foo::SuperTrait {}
1598 trait Trait2 where Self: foo::SuperTrait {} 1583trait Trait2 where Self: foo::SuperTrait {}
1599 1584
1600 fn test<T: Trait1, U: Trait2>(x: T, y: U) { 1585fn test<T: Trait1, U: Trait2>(x: T, y: U) {
1601 x.foo(); 1586 x.foo();
1602 y.foo(); 1587 y.foo();
1603 } 1588}"#,
1604 "#,
1605 expect![[r#" 1589 expect![[r#"
1606 49..53 'self': &Self 1590 49..53 'self': &Self
1607 62..64 '{}': () 1591 62..64 '{}': ()
@@ -1620,17 +1604,16 @@ fn super_trait_method_resolution() {
1620fn super_trait_impl_trait_method_resolution() { 1604fn super_trait_impl_trait_method_resolution() {
1621 check_infer( 1605 check_infer(
1622 r#" 1606 r#"
1623 mod foo { 1607mod foo {
1624 trait SuperTrait { 1608 trait SuperTrait {
1625 fn foo(&self) -> u32 {} 1609 fn foo(&self) -> u32 {}
1626 } 1610 }
1627 } 1611}
1628 trait Trait1: foo::SuperTrait {} 1612trait Trait1: foo::SuperTrait {}
1629 1613
1630 fn test(x: &impl Trait1) { 1614fn test(x: &impl Trait1) {
1631 x.foo(); 1615 x.foo();
1632 } 1616}"#,
1633 "#,
1634 expect![[r#" 1617 expect![[r#"
1635 49..53 'self': &Self 1618 49..53 'self': &Self
1636 62..64 '{}': () 1619 62..64 '{}': ()
@@ -1667,20 +1650,19 @@ fn super_trait_cycle() {
1667fn super_trait_assoc_type_bounds() { 1650fn super_trait_assoc_type_bounds() {
1668 check_infer( 1651 check_infer(
1669 r#" 1652 r#"
1670 trait SuperTrait { type Type; } 1653trait SuperTrait { type Type; }
1671 trait Trait where Self: SuperTrait {} 1654trait Trait where Self: SuperTrait {}
1672 1655
1673 fn get2<U, T: Trait<Type = U>>(t: T) -> U {} 1656fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
1674 fn set<T: Trait<Type = u64>>(t: T) -> T {t} 1657fn set<T: Trait<Type = u64>>(t: T) -> T {t}
1675 1658
1676 struct S<T>; 1659struct S<T>;
1677 impl<T> SuperTrait for S<T> { type Type = T; } 1660impl<T> SuperTrait for S<T> { type Type = T; }
1678 impl<T> Trait for S<T> {} 1661impl<T> Trait for S<T> {}
1679 1662
1680 fn test() { 1663fn test() {
1681 get2(set(S)); 1664 get2(set(S));
1682 } 1665}"#,
1683 "#,
1684 expect![[r#" 1666 expect![[r#"
1685 102..103 't': T 1667 102..103 't': T
1686 113..115 '{}': () 1668 113..115 '{}': ()
@@ -1701,16 +1683,15 @@ fn super_trait_assoc_type_bounds() {
1701fn fn_trait() { 1683fn fn_trait() {
1702 check_infer_with_mismatches( 1684 check_infer_with_mismatches(
1703 r#" 1685 r#"
1704 trait FnOnce<Args> { 1686trait FnOnce<Args> {
1705 type Output; 1687 type Output;
1706 1688
1707 fn call_once(self, args: Args) -> <Self as FnOnce<Args>>::Output; 1689 fn call_once(self, args: Args) -> <Self as FnOnce<Args>>::Output;
1708 } 1690}
1709 1691
1710 fn test<F: FnOnce(u32, u64) -> u128>(f: F) { 1692fn test<F: FnOnce(u32, u64) -> u128>(f: F) {
1711 f.call_once((1, 2)); 1693 f.call_once((1, 2));
1712 } 1694}"#,
1713 "#,
1714 expect![[r#" 1695 expect![[r#"
1715 56..60 'self': Self 1696 56..60 'self': Self
1716 62..66 'args': Args 1697 62..66 'args': Args
@@ -1729,37 +1710,36 @@ fn fn_trait() {
1729fn fn_ptr_and_item() { 1710fn fn_ptr_and_item() {
1730 check_infer_with_mismatches( 1711 check_infer_with_mismatches(
1731 r#" 1712 r#"
1732 #[lang="fn_once"] 1713#[lang="fn_once"]
1733 trait FnOnce<Args> { 1714trait FnOnce<Args> {
1734 type Output; 1715 type Output;
1735 1716
1736 fn call_once(self, args: Args) -> Self::Output; 1717 fn call_once(self, args: Args) -> Self::Output;
1737 } 1718}
1738 1719
1739 trait Foo<T> { 1720trait Foo<T> {
1740 fn foo(&self) -> T; 1721 fn foo(&self) -> T;
1741 } 1722}
1742 1723
1743 struct Bar<T>(T); 1724struct Bar<T>(T);
1744 1725
1745 impl<A1, R, F: FnOnce(A1) -> R> Foo<(A1, R)> for Bar<F> { 1726impl<A1, R, F: FnOnce(A1) -> R> Foo<(A1, R)> for Bar<F> {
1746 fn foo(&self) -> (A1, R) { loop {} } 1727 fn foo(&self) -> (A1, R) { loop {} }
1747 } 1728}
1748 1729
1749 enum Opt<T> { None, Some(T) } 1730enum Opt<T> { None, Some(T) }
1750 impl<T> Opt<T> { 1731impl<T> Opt<T> {
1751 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Opt<U> { loop {} } 1732 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Opt<U> { loop {} }
1752 } 1733}
1753 1734
1754 fn test() { 1735fn test() {
1755 let bar: Bar<fn(u8) -> u32>; 1736 let bar: Bar<fn(u8) -> u32>;
1756 bar.foo(); 1737 bar.foo();
1757 1738
1758 let opt: Opt<u8>; 1739 let opt: Opt<u8>;
1759 let f: fn(u8) -> u32; 1740 let f: fn(u8) -> u32;
1760 opt.map(f); 1741 opt.map(f);
1761 } 1742}"#,
1762 "#,
1763 expect![[r#" 1743 expect![[r#"
1764 74..78 'self': Self 1744 74..78 'self': Self
1765 80..84 'args': Args 1745 80..84 'args': Args
@@ -1790,46 +1770,45 @@ fn fn_ptr_and_item() {
1790fn fn_trait_deref_with_ty_default() { 1770fn fn_trait_deref_with_ty_default() {
1791 check_infer( 1771 check_infer(
1792 r#" 1772 r#"
1793 #[lang = "deref"] 1773#[lang = "deref"]
1794 trait Deref { 1774trait Deref {
1795 type Target; 1775 type Target;
1796 1776
1797 fn deref(&self) -> &Self::Target; 1777 fn deref(&self) -> &Self::Target;
1798 } 1778}
1799 1779
1800 #[lang="fn_once"] 1780#[lang="fn_once"]
1801 trait FnOnce<Args> { 1781trait FnOnce<Args> {
1802 type Output; 1782 type Output;
1803 1783
1804 fn call_once(self, args: Args) -> Self::Output; 1784 fn call_once(self, args: Args) -> Self::Output;
1805 } 1785}
1806 1786
1807 struct Foo; 1787struct Foo;
1808 1788
1809 impl Foo { 1789impl Foo {
1810 fn foo(&self) -> usize {} 1790 fn foo(&self) -> usize {}
1811 } 1791}
1812 1792
1813 struct Lazy<T, F = fn() -> T>(F); 1793struct Lazy<T, F = fn() -> T>(F);
1814 1794
1815 impl<T, F> Lazy<T, F> { 1795impl<T, F> Lazy<T, F> {
1816 pub fn new(f: F) -> Lazy<T, F> {} 1796 pub fn new(f: F) -> Lazy<T, F> {}
1817 } 1797}
1818 1798
1819 impl<T, F: FnOnce() -> T> Deref for Lazy<T, F> { 1799impl<T, F: FnOnce() -> T> Deref for Lazy<T, F> {
1820 type Target = T; 1800 type Target = T;
1821 } 1801}
1822 1802
1823 fn test() { 1803fn test() {
1824 let lazy1: Lazy<Foo, _> = Lazy::new(|| Foo); 1804 let lazy1: Lazy<Foo, _> = Lazy::new(|| Foo);
1825 let r1 = lazy1.foo(); 1805 let r1 = lazy1.foo();
1826 1806
1827 fn make_foo_fn() -> Foo {} 1807 fn make_foo_fn() -> Foo {}
1828 let make_foo_fn_ptr: fn() -> Foo = make_foo_fn; 1808 let make_foo_fn_ptr: fn() -> Foo = make_foo_fn;
1829 let lazy2: Lazy<Foo, _> = Lazy::new(make_foo_fn_ptr); 1809 let lazy2: Lazy<Foo, _> = Lazy::new(make_foo_fn_ptr);
1830 let r2 = lazy2.foo(); 1810 let r2 = lazy2.foo();
1831 } 1811}"#,
1832 "#,
1833 expect![[r#" 1812 expect![[r#"
1834 64..68 'self': &Self 1813 64..68 'self': &Self
1835 165..169 'self': Self 1814 165..169 'self': Self
@@ -1865,23 +1844,22 @@ fn fn_trait_deref_with_ty_default() {
1865fn closure_1() { 1844fn closure_1() {
1866 check_infer_with_mismatches( 1845 check_infer_with_mismatches(
1867 r#" 1846 r#"
1868 #[lang = "fn_once"] 1847#[lang = "fn_once"]
1869 trait FnOnce<Args> { 1848trait FnOnce<Args> {
1870 type Output; 1849 type Output;
1871 } 1850}
1872 1851
1873 enum Option<T> { Some(T), None } 1852enum Option<T> { Some(T), None }
1874 impl<T> Option<T> { 1853impl<T> Option<T> {
1875 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Option<U> { loop {} } 1854 fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Option<U> { loop {} }
1876 } 1855}
1877 1856
1878 fn test() { 1857fn test() {
1879 let x = Option::Some(1u32); 1858 let x = Option::Some(1u32);
1880 x.map(|v| v + 1); 1859 x.map(|v| v + 1);
1881 x.map(|_v| 1u64); 1860 x.map(|_v| 1u64);
1882 let y: Option<i64> = x.map(|_v| 1); 1861 let y: Option<i64> = x.map(|_v| 1);
1883 } 1862}"#,
1884 "#,
1885 expect![[r#" 1863 expect![[r#"
1886 147..151 'self': Option<T> 1864 147..151 'self': Option<T>
1887 153..154 'f': F 1865 153..154 'f': F
@@ -1919,33 +1897,32 @@ fn closure_1() {
1919fn closure_2() { 1897fn closure_2() {
1920 check_infer_with_mismatches( 1898 check_infer_with_mismatches(
1921 r#" 1899 r#"
1922 #[lang = "add"] 1900#[lang = "add"]
1923 pub trait Add<Rhs = Self> { 1901pub trait Add<Rhs = Self> {
1924 type Output; 1902 type Output;
1925 fn add(self, rhs: Rhs) -> Self::Output; 1903 fn add(self, rhs: Rhs) -> Self::Output;
1926 } 1904}
1927 1905
1928 trait FnOnce<Args> { 1906trait FnOnce<Args> {
1929 type Output; 1907 type Output;
1930 } 1908}
1931 1909
1932 impl Add for u64 { 1910impl Add for u64 {
1933 type Output = Self; 1911 type Output = Self;
1934 fn add(self, rhs: u64) -> Self::Output {0} 1912 fn add(self, rhs: u64) -> Self::Output {0}
1935 } 1913}
1936 1914
1937 impl Add for u128 { 1915impl Add for u128 {
1938 type Output = Self; 1916 type Output = Self;
1939 fn add(self, rhs: u128) -> Self::Output {0} 1917 fn add(self, rhs: u128) -> Self::Output {0}
1940 } 1918}
1941 1919
1942 fn test<F: FnOnce(u32) -> u64>(f: F) { 1920fn test<F: FnOnce(u32) -> u64>(f: F) {
1943 f(1); 1921 f(1);
1944 let g = |v| v + 1; 1922 let g = |v| v + 1;
1945 g(1u64); 1923 g(1u64);
1946 let h = |v| 1u128 + v; 1924 let h = |v| 1u128 + v;
1947 } 1925}"#,
1948 "#,
1949 expect![[r#" 1926 expect![[r#"
1950 72..76 'self': Self 1927 72..76 'self': Self
1951 78..81 'rhs': Rhs 1928 78..81 'rhs': Rhs
@@ -1985,29 +1962,28 @@ fn closure_2() {
1985fn closure_as_argument_inference_order() { 1962fn closure_as_argument_inference_order() {
1986 check_infer_with_mismatches( 1963 check_infer_with_mismatches(
1987 r#" 1964 r#"
1988 #[lang = "fn_once"] 1965#[lang = "fn_once"]
1989 trait FnOnce<Args> { 1966trait FnOnce<Args> {
1990 type Output; 1967 type Output;
1991 } 1968}
1992 1969
1993 fn foo1<T, U, F: FnOnce(T) -> U>(x: T, f: F) -> U { loop {} } 1970fn foo1<T, U, F: FnOnce(T) -> U>(x: T, f: F) -> U { loop {} }
1994 fn foo2<T, U, F: FnOnce(T) -> U>(f: F, x: T) -> U { loop {} } 1971fn foo2<T, U, F: FnOnce(T) -> U>(f: F, x: T) -> U { loop {} }
1995 1972
1996 struct S; 1973struct S;
1997 impl S { 1974impl S {
1998 fn method(self) -> u64; 1975 fn method(self) -> u64;
1999 1976
2000 fn foo1<T, U, F: FnOnce(T) -> U>(self, x: T, f: F) -> U { loop {} } 1977 fn foo1<T, U, F: FnOnce(T) -> U>(self, x: T, f: F) -> U { loop {} }
2001 fn foo2<T, U, F: FnOnce(T) -> U>(self, f: F, x: T) -> U { loop {} } 1978 fn foo2<T, U, F: FnOnce(T) -> U>(self, f: F, x: T) -> U { loop {} }
2002 } 1979}
2003 1980
2004 fn test() { 1981fn test() {
2005 let x1 = foo1(S, |s| s.method()); 1982 let x1 = foo1(S, |s| s.method());
2006 let x2 = foo2(|s| s.method(), S); 1983 let x2 = foo2(|s| s.method(), S);
2007 let x3 = S.foo1(S, |s| s.method()); 1984 let x3 = S.foo1(S, |s| s.method());
2008 let x4 = S.foo2(|s| s.method(), S); 1985 let x4 = S.foo2(|s| s.method(), S);
2009 } 1986}"#,
2010 "#,
2011 expect![[r#" 1987 expect![[r#"
2012 94..95 'x': T 1988 94..95 'x': T
2013 100..101 'f': F 1989 100..101 'f': F
@@ -2136,27 +2112,26 @@ fn test<T, U>() where T::Item: Trait2, T: Trait<U::Item>, U: Trait<()> {
2136fn unselected_projection_on_impl_self() { 2112fn unselected_projection_on_impl_self() {
2137 check_infer( 2113 check_infer(
2138 r#" 2114 r#"
2139 //- /main.rs 2115//- /main.rs
2140 trait Trait { 2116trait Trait {
2141 type Item; 2117 type Item;
2142 2118
2143 fn f(&self, x: Self::Item); 2119 fn f(&self, x: Self::Item);
2144 } 2120}
2145 2121
2146 struct S; 2122struct S;
2147 2123
2148 impl Trait for S { 2124impl Trait for S {
2149 type Item = u32; 2125 type Item = u32;
2150 fn f(&self, x: Self::Item) { let y = x; } 2126 fn f(&self, x: Self::Item) { let y = x; }
2151 } 2127}
2152 2128
2153 struct S2; 2129struct S2;
2154 2130
2155 impl Trait for S2 { 2131impl Trait for S2 {
2156 type Item = i32; 2132 type Item = i32;
2157 fn f(&self, x: <Self>::Item) { let y = x; } 2133 fn f(&self, x: <Self>::Item) { let y = x; }
2158 } 2134}"#,
2159 "#,
2160 expect![[r#" 2135 expect![[r#"
2161 40..44 'self': &Self 2136 40..44 'self': &Self
2162 46..47 'x': Trait::Item<Self> 2137 46..47 'x': Trait::Item<Self>
@@ -2392,58 +2367,57 @@ fn test<I: Iterator<Item: Iterator<Item = u32>>>() {
2392fn proc_macro_server_types() { 2367fn proc_macro_server_types() {
2393 check_infer( 2368 check_infer(
2394 r#" 2369 r#"
2395 macro_rules! with_api { 2370macro_rules! with_api {
2396 ($S:ident, $self:ident, $m:ident) => { 2371 ($S:ident, $self:ident, $m:ident) => {
2397 $m! { 2372 $m! {
2398 TokenStream { 2373 TokenStream {
2399 fn new() -> $S::TokenStream; 2374 fn new() -> $S::TokenStream;
2400 }, 2375 },
2401 Group { 2376 Group {
2402 }, 2377 },
2403 }
2404 };
2405 }
2406 macro_rules! associated_item {
2407 (type TokenStream) =>
2408 (type TokenStream: 'static;);
2409 (type Group) =>
2410 (type Group: 'static;);
2411 ($($item:tt)*) => ($($item)*;)
2412 } 2378 }
2413 macro_rules! declare_server_traits { 2379 };
2414 ($($name:ident { 2380}
2415 $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)* 2381macro_rules! associated_item {
2416 }),* $(,)?) => { 2382 (type TokenStream) =>
2417 pub trait Types { 2383 (type TokenStream: 'static;);
2418 $(associated_item!(type $name);)* 2384 (type Group) =>
2419 } 2385 (type Group: 'static;);
2420 2386 ($($item:tt)*) => ($($item)*;)
2421 $(pub trait $name: Types { 2387}
2422 $(associated_item!(fn $method($($arg: $arg_ty),*) $(-> $ret_ty)?);)* 2388macro_rules! declare_server_traits {
2423 })* 2389 ($($name:ident {
2424 2390 $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
2425 pub trait Server: Types $(+ $name)* {} 2391 }),* $(,)?) => {
2426 impl<S: Types $(+ $name)*> Server for S {} 2392 pub trait Types {
2427 } 2393 $(associated_item!(type $name);)*
2428 } 2394 }
2429 2395
2430 with_api!(Self, self_, declare_server_traits); 2396 $(pub trait $name: Types {
2431 struct G {} 2397 $(associated_item!(fn $method($($arg: $arg_ty),*) $(-> $ret_ty)?);)*
2432 struct T {} 2398 })*
2433 struct Rustc;
2434 impl Types for Rustc {
2435 type TokenStream = T;
2436 type Group = G;
2437 }
2438 2399
2439 fn make<T>() -> T { loop {} } 2400 pub trait Server: Types $(+ $name)* {}
2440 impl TokenStream for Rustc { 2401 impl<S: Types $(+ $name)*> Server for S {}
2441 fn new() -> Self::TokenStream { 2402 }
2442 let group: Self::Group = make(); 2403}
2443 make() 2404
2444 } 2405with_api!(Self, self_, declare_server_traits);
2445 } 2406struct G {}
2446 "#, 2407struct T {}
2408struct Rustc;
2409impl Types for Rustc {
2410 type TokenStream = T;
2411 type Group = G;
2412}
2413
2414fn make<T>() -> T { loop {} }
2415impl TokenStream for Rustc {
2416 fn new() -> Self::TokenStream {
2417 let group: Self::Group = make();
2418 make()
2419 }
2420}"#,
2447 expect![[r#" 2421 expect![[r#"
2448 1061..1072 '{ loop {} }': T 2422 1061..1072 '{ loop {} }': T
2449 1063..1070 'loop {}': ! 2423 1063..1070 'loop {}': !
@@ -2462,23 +2436,22 @@ fn proc_macro_server_types() {
2462fn unify_impl_trait() { 2436fn unify_impl_trait() {
2463 check_infer_with_mismatches( 2437 check_infer_with_mismatches(
2464 r#" 2438 r#"
2465 trait Trait<T> {} 2439trait Trait<T> {}
2466 2440
2467 fn foo(x: impl Trait<u32>) { loop {} } 2441fn foo(x: impl Trait<u32>) { loop {} }
2468 fn bar<T>(x: impl Trait<T>) -> T { loop {} } 2442fn bar<T>(x: impl Trait<T>) -> T { loop {} }
2469 2443
2470 struct S<T>(T); 2444struct S<T>(T);
2471 impl<T> Trait<T> for S<T> {} 2445impl<T> Trait<T> for S<T> {}
2472 2446
2473 fn default<T>() -> T { loop {} } 2447fn default<T>() -> T { loop {} }
2474 2448
2475 fn test() -> impl Trait<i32> { 2449fn test() -> impl Trait<i32> {
2476 let s1 = S(default()); 2450 let s1 = S(default());
2477 foo(s1); 2451 foo(s1);
2478 let x: i32 = bar(S(default())); 2452 let x: i32 = bar(S(default()));
2479 S(default()) 2453 S(default())
2480 } 2454}"#,
2481 "#,
2482 expect![[r#" 2455 expect![[r#"
2483 26..27 'x': impl Trait<u32> 2456 26..27 'x': impl Trait<u32>
2484 46..57 '{ loop {} }': () 2457 46..57 '{ loop {} }': ()
@@ -2519,30 +2492,29 @@ fn unify_impl_trait() {
2519fn assoc_types_from_bounds() { 2492fn assoc_types_from_bounds() {
2520 check_infer( 2493 check_infer(
2521 r#" 2494 r#"
2522 //- /main.rs 2495//- /main.rs
2523 #[lang = "fn_once"] 2496#[lang = "fn_once"]
2524 trait FnOnce<Args> { 2497trait FnOnce<Args> {
2525 type Output; 2498 type Output;
2526 } 2499}
2527 2500
2528 trait T { 2501trait T {
2529 type O; 2502 type O;
2530 } 2503}
2531 2504
2532 impl T for () { 2505impl T for () {
2533 type O = (); 2506 type O = ();
2534 } 2507}
2535 2508
2536 fn f<X, F>(_v: F) 2509fn f<X, F>(_v: F)
2537 where 2510where
2538 X: T, 2511 X: T,
2539 F: FnOnce(&X::O), 2512 F: FnOnce(&X::O),
2540 { } 2513{ }
2541 2514
2542 fn main() { 2515fn main() {
2543 f::<(), _>(|z| { z; }); 2516 f::<(), _>(|z| { z; });
2544 } 2517}"#,
2545 "#,
2546 expect![[r#" 2518 expect![[r#"
2547 133..135 '_v': F 2519 133..135 '_v': F
2548 178..181 '{ }': () 2520 178..181 '{ }': ()
@@ -2628,76 +2600,75 @@ fn test() {
2628fn iterator_chain() { 2600fn iterator_chain() {
2629 check_infer_with_mismatches( 2601 check_infer_with_mismatches(
2630 r#" 2602 r#"
2631 //- /main.rs 2603//- /main.rs
2632 #[lang = "fn_once"] 2604#[lang = "fn_once"]
2633 trait FnOnce<Args> { 2605trait FnOnce<Args> {
2634 type Output; 2606 type Output;
2635 } 2607}
2636 #[lang = "fn_mut"] 2608#[lang = "fn_mut"]
2637 trait FnMut<Args>: FnOnce<Args> { } 2609trait FnMut<Args>: FnOnce<Args> { }
2638 2610
2639 enum Option<T> { Some(T), None } 2611enum Option<T> { Some(T), None }
2640 use Option::*; 2612use Option::*;
2641 2613
2642 pub trait Iterator { 2614pub trait Iterator {
2643 type Item; 2615 type Item;
2644 2616
2645 fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F> 2617 fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
2646 where 2618 where
2647 F: FnMut(Self::Item) -> Option<B>, 2619 F: FnMut(Self::Item) -> Option<B>,
2648 { loop {} } 2620 { loop {} }
2649 2621
2650 fn for_each<F>(self, f: F) 2622 fn for_each<F>(self, f: F)
2651 where 2623 where
2652 F: FnMut(Self::Item), 2624 F: FnMut(Self::Item),
2653 { loop {} } 2625 { loop {} }
2654 } 2626}
2655 2627
2656 pub trait IntoIterator { 2628pub trait IntoIterator {
2657 type Item; 2629 type Item;
2658 type IntoIter: Iterator<Item = Self::Item>; 2630 type IntoIter: Iterator<Item = Self::Item>;
2659 fn into_iter(self) -> Self::IntoIter; 2631 fn into_iter(self) -> Self::IntoIter;
2660 } 2632}
2661 2633
2662 pub struct FilterMap<I, F> { } 2634pub struct FilterMap<I, F> { }
2663 impl<B, I: Iterator, F> Iterator for FilterMap<I, F> 2635impl<B, I: Iterator, F> Iterator for FilterMap<I, F>
2664 where 2636where
2665 F: FnMut(I::Item) -> Option<B>, 2637 F: FnMut(I::Item) -> Option<B>,
2666 { 2638{
2667 type Item = B; 2639 type Item = B;
2668 } 2640}
2669 2641
2670 #[stable(feature = "rust1", since = "1.0.0")] 2642#[stable(feature = "rust1", since = "1.0.0")]
2671 impl<I: Iterator> IntoIterator for I { 2643impl<I: Iterator> IntoIterator for I {
2672 type Item = I::Item; 2644 type Item = I::Item;
2673 type IntoIter = I; 2645 type IntoIter = I;
2674 2646
2675 fn into_iter(self) -> I { 2647 fn into_iter(self) -> I {
2676 self 2648 self
2677 } 2649 }
2678 } 2650}
2679 2651
2680 struct Vec<T> {} 2652struct Vec<T> {}
2681 impl<T> Vec<T> { 2653impl<T> Vec<T> {
2682 fn new() -> Self { loop {} } 2654 fn new() -> Self { loop {} }
2683 } 2655}
2684 2656
2685 impl<T> IntoIterator for Vec<T> { 2657impl<T> IntoIterator for Vec<T> {
2686 type Item = T; 2658 type Item = T;
2687 type IntoIter = IntoIter<T>; 2659 type IntoIter = IntoIter<T>;
2688 } 2660}
2689 2661
2690 pub struct IntoIter<T> { } 2662pub struct IntoIter<T> { }
2691 impl<T> Iterator for IntoIter<T> { 2663impl<T> Iterator for IntoIter<T> {
2692 type Item = T; 2664 type Item = T;
2693 } 2665}
2694 2666
2695 fn main() { 2667fn main() {
2696 Vec::<i32>::new().into_iter() 2668 Vec::<i32>::new().into_iter()
2697 .filter_map(|x| if x > 0 { Some(x as u32) } else { None }) 2669 .filter_map(|x| if x > 0 { Some(x as u32) } else { None })
2698 .for_each(|y| { y; }); 2670 .for_each(|y| { y; });
2699 } 2671}"#,
2700 "#,
2701 expect![[r#" 2672 expect![[r#"
2702 226..230 'self': Self 2673 226..230 'self': Self
2703 232..233 'f': F 2674 232..233 'f': F
@@ -2779,14 +2750,13 @@ fn main() {
2779fn trait_object_no_coercion() { 2750fn trait_object_no_coercion() {
2780 check_infer_with_mismatches( 2751 check_infer_with_mismatches(
2781 r#" 2752 r#"
2782 trait Foo {} 2753trait Foo {}
2783 2754
2784 fn foo(x: &dyn Foo) {} 2755fn foo(x: &dyn Foo) {}
2785 2756
2786 fn test(x: &dyn Foo) { 2757fn test(x: &dyn Foo) {
2787 foo(x); 2758 foo(x);
2788 } 2759}"#,
2789 "#,
2790 expect![[r#" 2760 expect![[r#"
2791 21..22 'x': &dyn Foo 2761 21..22 'x': &dyn Foo
2792 34..36 '{}': () 2762 34..36 '{}': ()
@@ -2803,23 +2773,22 @@ fn trait_object_no_coercion() {
2803fn builtin_copy() { 2773fn builtin_copy() {
2804 check_infer_with_mismatches( 2774 check_infer_with_mismatches(
2805 r#" 2775 r#"
2806 #[lang = "copy"] 2776#[lang = "copy"]
2807 trait Copy {} 2777trait Copy {}
2808 2778
2809 struct IsCopy; 2779struct IsCopy;
2810 impl Copy for IsCopy {} 2780impl Copy for IsCopy {}
2811 struct NotCopy; 2781struct NotCopy;
2812 2782
2813 trait Test { fn test(&self) -> bool; } 2783trait Test { fn test(&self) -> bool; }
2814 impl<T: Copy> Test for T {} 2784impl<T: Copy> Test for T {}
2815 2785
2816 fn test() { 2786fn test() {
2817 IsCopy.test(); 2787 IsCopy.test();
2818 NotCopy.test(); 2788 NotCopy.test();
2819 (IsCopy, IsCopy).test(); 2789 (IsCopy, IsCopy).test();
2820 (IsCopy, NotCopy).test(); 2790 (IsCopy, NotCopy).test();
2821 } 2791}"#,
2822 "#,
2823 expect![[r#" 2792 expect![[r#"
2824 110..114 'self': &Self 2793 110..114 'self': &Self
2825 166..267 '{ ...t(); }': () 2794 166..267 '{ ...t(); }': ()
@@ -2843,24 +2812,23 @@ fn builtin_copy() {
2843fn builtin_fn_def_copy() { 2812fn builtin_fn_def_copy() {
2844 check_infer_with_mismatches( 2813 check_infer_with_mismatches(
2845 r#" 2814 r#"
2846 #[lang = "copy"] 2815#[lang = "copy"]
2847 trait Copy {} 2816trait Copy {}
2848 2817
2849 fn foo() {} 2818fn foo() {}
2850 fn bar<T: Copy>(T) -> T {} 2819fn bar<T: Copy>(T) -> T {}
2851 struct Struct(usize); 2820struct Struct(usize);
2852 enum Enum { Variant(usize) } 2821enum Enum { Variant(usize) }
2853 2822
2854 trait Test { fn test(&self) -> bool; } 2823trait Test { fn test(&self) -> bool; }
2855 impl<T: Copy> Test for T {} 2824impl<T: Copy> Test for T {}
2856 2825
2857 fn test() { 2826fn test() {
2858 foo.test(); 2827 foo.test();
2859 bar.test(); 2828 bar.test();
2860 Struct.test(); 2829 Struct.test();
2861 Enum::Variant.test(); 2830 Enum::Variant.test();
2862 } 2831}"#,
2863 "#,
2864 expect![[r#" 2832 expect![[r#"
2865 41..43 '{}': () 2833 41..43 '{}': ()
2866 60..61 'T': {unknown} 2834 60..61 'T': {unknown}
@@ -2884,18 +2852,17 @@ fn builtin_fn_def_copy() {
2884fn builtin_fn_ptr_copy() { 2852fn builtin_fn_ptr_copy() {
2885 check_infer_with_mismatches( 2853 check_infer_with_mismatches(
2886 r#" 2854 r#"
2887 #[lang = "copy"] 2855#[lang = "copy"]
2888 trait Copy {} 2856trait Copy {}
2889 2857
2890 trait Test { fn test(&self) -> bool; } 2858trait Test { fn test(&self) -> bool; }
2891 impl<T: Copy> Test for T {} 2859impl<T: Copy> Test for T {}
2892 2860
2893 fn test(f1: fn(), f2: fn(usize) -> u8, f3: fn(u8, u8) -> &u8) { 2861fn test(f1: fn(), f2: fn(usize) -> u8, f3: fn(u8, u8) -> &u8) {
2894 f1.test(); 2862 f1.test();
2895 f2.test(); 2863 f2.test();
2896 f3.test(); 2864 f3.test();
2897 } 2865}"#,
2898 "#,
2899 expect![[r#" 2866 expect![[r#"
2900 54..58 'self': &Self 2867 54..58 'self': &Self
2901 108..110 'f1': fn() 2868 108..110 'f1': fn()
@@ -2916,19 +2883,18 @@ fn builtin_fn_ptr_copy() {
2916fn builtin_sized() { 2883fn builtin_sized() {
2917 check_infer_with_mismatches( 2884 check_infer_with_mismatches(
2918 r#" 2885 r#"
2919 #[lang = "sized"] 2886#[lang = "sized"]
2920 trait Sized {} 2887trait Sized {}
2921 2888
2922 trait Test { fn test(&self) -> bool; } 2889trait Test { fn test(&self) -> bool; }
2923 impl<T: Sized> Test for T {} 2890impl<T: Sized> Test for T {}
2924 2891
2925 fn test() { 2892fn test() {
2926 1u8.test(); 2893 1u8.test();
2927 (*"foo").test(); // not Sized 2894 (*"foo").test(); // not Sized
2928 (1u8, 1u8).test(); 2895 (1u8, 1u8).test();
2929 (1u8, *"foo").test(); // not Sized 2896 (1u8, *"foo").test(); // not Sized
2930 } 2897}"#,
2931 "#,
2932 expect![[r#" 2898 expect![[r#"
2933 56..60 'self': &Self 2899 56..60 'self': &Self
2934 113..228 '{ ...ized }': () 2900 113..228 '{ ...ized }': ()
@@ -2998,19 +2964,18 @@ impl<A: Step> iter::Iterator for ops::Range<A> {
2998fn infer_closure_arg() { 2964fn infer_closure_arg() {
2999 check_infer( 2965 check_infer(
3000 r#" 2966 r#"
3001 //- /lib.rs 2967//- /lib.rs
3002 2968
3003 enum Option<T> { 2969enum Option<T> {
3004 None, 2970 None,
3005 Some(T) 2971 Some(T)
3006 } 2972}
3007 2973
3008 fn foo() { 2974fn foo() {
3009 let s = Option::None; 2975 let s = Option::None;
3010 let f = |x: Option<i32>| {}; 2976 let f = |x: Option<i32>| {};
3011 (&f)(s) 2977 (&f)(s)
3012 } 2978}"#,
3013 "#,
3014 expect![[r#" 2979 expect![[r#"
3015 52..126 '{ ...)(s) }': () 2980 52..126 '{ ...)(s) }': ()
3016 62..63 's': Option<i32> 2981 62..63 's': Option<i32>
@@ -3079,46 +3044,45 @@ fn infer_box_fn_arg() {
3079 // The type mismatch is a bug 3044 // The type mismatch is a bug
3080 check_infer_with_mismatches( 3045 check_infer_with_mismatches(
3081 r#" 3046 r#"
3082 //- /lib.rs deps:std 3047//- /lib.rs deps:std
3083 3048
3084 #[lang = "fn_once"] 3049#[lang = "fn_once"]
3085 pub trait FnOnce<Args> { 3050pub trait FnOnce<Args> {
3086 type Output; 3051 type Output;
3087 3052
3088 extern "rust-call" fn call_once(self, args: Args) -> Self::Output; 3053 extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
3089 } 3054}
3090 3055
3091 #[lang = "deref"] 3056#[lang = "deref"]
3092 pub trait Deref { 3057pub trait Deref {
3093 type Target: ?Sized; 3058 type Target: ?Sized;
3094 3059
3095 fn deref(&self) -> &Self::Target; 3060 fn deref(&self) -> &Self::Target;
3096 } 3061}
3097 3062
3098 #[lang = "owned_box"] 3063#[lang = "owned_box"]
3099 pub struct Box<T: ?Sized> { 3064pub struct Box<T: ?Sized> {
3100 inner: *mut T, 3065 inner: *mut T,
3101 } 3066}
3102 3067
3103 impl<T: ?Sized> Deref for Box<T> { 3068impl<T: ?Sized> Deref for Box<T> {
3104 type Target = T; 3069 type Target = T;
3105 3070
3106 fn deref(&self) -> &T { 3071 fn deref(&self) -> &T {
3107 &self.inner 3072 &self.inner
3108 } 3073 }
3109 } 3074}
3110 3075
3111 enum Option<T> { 3076enum Option<T> {
3112 None, 3077 None,
3113 Some(T) 3078 Some(T)
3114 } 3079}
3115 3080
3116 fn foo() { 3081fn foo() {
3117 let s = Option::None; 3082 let s = Option::None;
3118 let f: Box<dyn FnOnce(&Option<i32>)> = box (|ps| {}); 3083 let f: Box<dyn FnOnce(&Option<i32>)> = box (|ps| {});
3119 f(&s); 3084 f(&s);
3120 } 3085}"#,
3121 "#,
3122 expect![[r#" 3086 expect![[r#"
3123 100..104 'self': Self 3087 100..104 'self': Self
3124 106..110 'args': Args 3088 106..110 'args': Args
@@ -3284,8 +3248,7 @@ fn f() {
3284 ().method(); 3248 ().method();
3285 //^^^^^^^^^^^ u8 3249 //^^^^^^^^^^^ u8
3286 } 3250 }
3287} 3251}"#,
3288 "#,
3289 expect![[r#" 3252 expect![[r#"
3290 46..50 'self': &Self 3253 46..50 'self': &Self
3291 58..63 '{ 0 }': u8 3254 58..63 '{ 0 }': u8
@@ -3339,8 +3302,7 @@ fn f() {
3339 fn inner() -> S { 3302 fn inner() -> S {
3340 let s = inner(); 3303 let s = inner();
3341 } 3304 }
3342} 3305}"#,
3343 "#,
3344 expect![[r#" 3306 expect![[r#"
3345 17..73 '{ ... } }': () 3307 17..73 '{ ... } }': ()
3346 39..71 '{ ... }': () 3308 39..71 '{ ... }': ()
@@ -3375,8 +3337,7 @@ fn test() {
3375 let x = A; 3337 let x = A;
3376 let y = A; 3338 let y = A;
3377 let r = x.do_op(y); 3339 let r = x.do_op(y);
3378} 3340}"#,
3379 "#,
3380 expect![[r#" 3341 expect![[r#"
3381 63..67 'self': Self 3342 63..67 'self': Self
3382 69..72 'rhs': RHS 3343 69..72 'rhs': RHS
@@ -3425,9 +3386,7 @@ impl foo::Bar for F {
3425fn foo() { 3386fn foo() {
3426 use foo::Bar; 3387 use foo::Bar;
3427 let x = <F as Bar>::boo(); 3388 let x = <F as Bar>::boo();
3428} 3389}"#,
3429
3430 "#,
3431 expect![[r#" 3390 expect![[r#"
3432 132..163 '{ ... }': Bar::Output<Self> 3391 132..163 '{ ... }': Bar::Output<Self>
3433 146..153 'loop {}': ! 3392 146..153 'loop {}': !
@@ -3465,8 +3424,7 @@ fn foo() {
3465 3424
3466pub trait Deserialize { 3425pub trait Deserialize {
3467 fn deserialize() -> u8; 3426 fn deserialize() -> u8;
3468} 3427}"#,
3469 "#,
3470 ); 3428 );
3471} 3429}
3472 3430