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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/unsized/issue-71659.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/unsized/issue-71659.rs')
-rw-r--r-- | tests/ui/unsized/issue-71659.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/unsized/issue-71659.rs b/tests/ui/unsized/issue-71659.rs new file mode 100644 index 000000000..3524ca02b --- /dev/null +++ b/tests/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 +} |