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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/unsized/issue-71659.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/unsized/issue-71659.rs')
-rw-r--r-- | src/test/ui/unsized/issue-71659.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/unsized/issue-71659.rs b/src/test/ui/unsized/issue-71659.rs new file mode 100644 index 000000000..3524ca02b --- /dev/null +++ b/src/test/ui/unsized/issue-71659.rs @@ -0,0 +1,32 @@ +#![feature(unsize)] + +use std::marker::Unsize; + +pub trait CastTo<T: ?Sized>: Unsize<T> { + fn cast_to(&self) -> &T; +} + +impl<T: ?Sized, U: ?Sized + Unsize<T>> CastTo<T> for U { + fn cast_to(&self) -> &T { + self + } +} + +impl<T: ?Sized> Cast for T {} +pub trait Cast { + fn cast<T: ?Sized>(&self) -> &T + where + Self: CastTo<T>, + { + self + } +} + +pub trait Foo: CastTo<[i32]> {} +impl Foo for [i32; 0] {} + +fn main() { + let x: &dyn Foo = &[]; + let x = x.cast::<[i32]>(); + //~^ ERROR: the trait bound `dyn Foo: CastTo<[i32]>` is not satisfied +} |