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Rollup merge of rust-lang#92582 - lcnr:generic-arg-infer, r=BoxyUwU
improve `_` constants in item signature handling removing the "type" from the error messages does slightly worsen the error messages for types, but figuring out whether the placeholder is for a type or a constant and correctly dealing with that seemed fairly difficult to me so I took the easy way out ✨ Imo the error message is still clear enough. r? `@BoxyUwU` cc `@estebank`
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12 changes: 0 additions & 12 deletions
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src/test/ui/const-generics/generic_arg_infer/array-in-sig.rs
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src/test/ui/const-generics/generic_arg_infer/array-in-sig.stderr
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61 changes: 61 additions & 0 deletions
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src/test/ui/const-generics/generic_arg_infer/in-signature.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| #![crate_type = "rlib"] | ||
| #![feature(generic_arg_infer)] | ||
|
|
||
| struct Foo<const N: usize>; | ||
| struct Bar<T, const N: usize>(T); | ||
|
|
||
| fn arr_fn() -> [u8; _] { | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types | ||
| [0; 3] | ||
| } | ||
|
|
||
| fn ty_fn() -> Bar<i32, _> { | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types | ||
| Bar::<i32, 3>(0) | ||
| } | ||
|
|
||
| fn ty_fn_mixed() -> Bar<_, _> { | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types | ||
| Bar::<i32, 3>(0) | ||
| } | ||
|
|
||
| const ARR_CT: [u8; _] = [0; 3]; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| static ARR_STATIC: [u8; _] = [0; 3]; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables | ||
| const TY_CT: Bar<i32, _> = Bar::<i32, 3>(0); | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| static TY_STATIC: Bar<i32, _> = Bar::<i32, 3>(0); | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables | ||
| const TY_CT_MIXED: Bar<_, _> = Bar::<i32, 3>(0); | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| static TY_STATIC_MIXED: Bar<_, _> = Bar::<i32, 3>(0); | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables | ||
| trait ArrAssocConst { | ||
| const ARR: [u8; _]; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| } | ||
| trait TyAssocConst { | ||
| const ARR: Bar<i32, _>; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| } | ||
| trait TyAssocConstMixed { | ||
| const ARR: Bar<_, _>; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for constants | ||
| } | ||
|
|
||
| trait AssocTy { | ||
| type Assoc; | ||
| } | ||
| impl AssocTy for i8 { | ||
| type Assoc = [u8; _]; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for associated types | ||
| } | ||
| impl AssocTy for i16 { | ||
| type Assoc = Bar<i32, _>; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for associated types | ||
| } | ||
| impl AssocTy for i32 { | ||
| type Assoc = Bar<_, _>; | ||
| //~^ ERROR the placeholder `_` is not allowed within types on item signatures for associated types | ||
| } |
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