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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/generic-associated-types/issue-91762.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/generic-associated-types/issue-91762.rs')
-rw-r--r-- | src/test/ui/generic-associated-types/issue-91762.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/issue-91762.rs b/src/test/ui/generic-associated-types/issue-91762.rs new file mode 100644 index 000000000..b259a3c6e --- /dev/null +++ b/src/test/ui/generic-associated-types/issue-91762.rs @@ -0,0 +1,30 @@ +// check-fail + +// FIXME(generic_associated_types): We almost certaintly want this to pass, but +// it's particularly difficult currently, because we need a way of specifying +// that `<Self::Base as Functor>::With<T> = Self` without using that when we have +// a `U`. See `https://github.com/rust-lang/rust/pull/92728` for a (hacky) +// solution. This might be better to just wait for Chalk. + +#![feature(generic_associated_types)] + +pub trait Functor { + type With<T>; + + fn fmap<T, U>(this: Self::With<T>) -> Self::With<U>; +} + +pub trait FunctorExt<T>: Sized { + type Base: Functor<With<T> = Self>; + + fn fmap<U>(self) { + let arg: <Self::Base as Functor>::With<T>; + let ret: <Self::Base as Functor>::With<U>; + + arg = self; + ret = <Self::Base as Functor>::fmap(arg); + //~^ type annotations needed + } +} + +fn main() {} |