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| author | Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de> | 2024-06-10 10:15:37 +0000 |
|---|---|---|
| committer | Oli Scherer <git-spam-no-reply9815368754983@oli-obk.de> | 2024-06-17 10:57:52 +0000 |
| commit | 94f549502f4bf6fae35f17c823924f041217c8f4 (patch) | |
| tree | 4b8fa126b69cb8f5ca9004849a9aff16fce0b5eb /tests/ui/coercion | |
| parent | e23ae72ac7a393961886ea62df065ebb6def7d51 (diff) | |
Use subtyping instead of equality, since method resolution also uses subtyping
Diffstat (limited to 'tests/ui/coercion')
3 files changed, 20 insertions, 8 deletions
diff --git a/tests/ui/coercion/coerce-issue-49593-box-never.fallback.stderr b/tests/ui/coercion/coerce-issue-49593-box-never.fallback.stderr new file mode 100644 index 00000000000..e9b43d6145c --- /dev/null +++ b/tests/ui/coercion/coerce-issue-49593-box-never.fallback.stderr @@ -0,0 +1,11 @@ +error[E0277]: the trait bound `(): std::error::Error` is not satisfied + --> $DIR/coerce-issue-49593-box-never.rs:19:5 + | +LL | Box::<_ /* ! */>::new(x) + | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `()` + | + = note: required for the cast from `Box<()>` to `Box<(dyn std::error::Error + 'static)>` + +error: aborting due to 1 previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/coercion/coerce-issue-49593-box-never.nofallback.stderr b/tests/ui/coercion/coerce-issue-49593-box-never.nofallback.stderr index 0d98fa93e5a..1215f5f9d88 100644 --- a/tests/ui/coercion/coerce-issue-49593-box-never.nofallback.stderr +++ b/tests/ui/coercion/coerce-issue-49593-box-never.nofallback.stderr @@ -1,13 +1,13 @@ error[E0277]: the trait bound `(): std::error::Error` is not satisfied - --> $DIR/coerce-issue-49593-box-never.rs:18:53 + --> $DIR/coerce-issue-49593-box-never.rs:19:5 | -LL | /* *mut $0 is coerced to Box<dyn Error> here */ Box::<_ /* ! */>::new(x) - | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `()` +LL | Box::<_ /* ! */>::new(x) + | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `()` | = note: required for the cast from `Box<()>` to `Box<(dyn std::error::Error + 'static)>` error[E0277]: the trait bound `(): std::error::Error` is not satisfied - --> $DIR/coerce-issue-49593-box-never.rs:23:49 + --> $DIR/coerce-issue-49593-box-never.rs:24:49 | LL | /* *mut $0 is coerced to *mut Error here */ raw_ptr_box::<_ /* ! */>(x) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `()` diff --git a/tests/ui/coercion/coerce-issue-49593-box-never.rs b/tests/ui/coercion/coerce-issue-49593-box-never.rs index 19a2c036fbc..f93fbb70dce 100644 --- a/tests/ui/coercion/coerce-issue-49593-box-never.rs +++ b/tests/ui/coercion/coerce-issue-49593-box-never.rs @@ -1,7 +1,6 @@ //@ revisions: nofallback fallback //@ ignore-windows - the number of `Error` impls is platform-dependent -//@[fallback] check-pass -//@[nofallback] check-fail +//@check-fail #![feature(never_type)] #![cfg_attr(fallback, feature(never_type_fallback))] @@ -15,8 +14,10 @@ fn raw_ptr_box<T>(t: T) -> *mut T { } fn foo(x: !) -> Box<dyn Error> { - /* *mut $0 is coerced to Box<dyn Error> here */ Box::<_ /* ! */>::new(x) - //[nofallback]~^ ERROR trait bound `(): std::error::Error` is not satisfied + // Subtyping during method resolution will generate new inference vars and + // subtype them. Thus fallback will not fall back to `!`, but `()` instead. + Box::<_ /* ! */>::new(x) + //~^ ERROR trait bound `(): std::error::Error` is not satisfied } fn foo_raw_ptr(x: !) -> *mut dyn Error { |