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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/auto-traits/typeck-default-trait-impl-precedence.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/auto-traits/typeck-default-trait-impl-precedence.rs')
-rw-r--r-- | tests/ui/auto-traits/typeck-default-trait-impl-precedence.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/auto-traits/typeck-default-trait-impl-precedence.rs b/tests/ui/auto-traits/typeck-default-trait-impl-precedence.rs new file mode 100644 index 000000000..2bbe82270 --- /dev/null +++ b/tests/ui/auto-traits/typeck-default-trait-impl-precedence.rs @@ -0,0 +1,21 @@ +// Test that declaring that `&T` is `Defaulted` if `T:Signed` implies +// that other `&T` is NOT `Defaulted` if `T:Signed` does not hold. In +// other words, the auto impl only applies if there are no existing +// impls whose types unify. + +#![feature(auto_traits)] +#![feature(negative_impls)] + +auto trait Defaulted { } +impl<'a,T:Signed> Defaulted for &'a T { } +impl<'a,T:Signed> Defaulted for &'a mut T { } +fn is_defaulted<T:Defaulted>() { } + +trait Signed { } +impl Signed for i32 { } + +fn main() { + is_defaulted::<&'static i32>(); + is_defaulted::<&'static u32>(); + //~^ ERROR `u32: Signed` is not satisfied +} |