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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 09:26:03 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-19 09:26:03 +0000 |
commit | 9918693037dce8aa4bb6f08741b6812923486c18 (patch) | |
tree | 21d2b40bec7e6a7ea664acee056eb3d08e15a1cf /tests/ui/traits/next-solver/alias-sub.rs | |
parent | Releasing progress-linux version 1.75.0+dfsg1-5~progress7.99u1. (diff) | |
download | rustc-9918693037dce8aa4bb6f08741b6812923486c18.tar.xz rustc-9918693037dce8aa4bb6f08741b6812923486c18.zip |
Merging upstream version 1.76.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/traits/next-solver/alias-sub.rs')
-rw-r--r-- | tests/ui/traits/next-solver/alias-sub.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/alias-sub.rs b/tests/ui/traits/next-solver/alias-sub.rs new file mode 100644 index 000000000..f7f23a024 --- /dev/null +++ b/tests/ui/traits/next-solver/alias-sub.rs @@ -0,0 +1,34 @@ +// compile-flags: -Znext-solver +// check-pass + +trait Trait { + type Assoc: Sized; +} + +impl Trait for &'static str { + type Assoc = &'static str; +} + +// Wrapper is just here to get around stupid `Sized` obligations in mir typeck +struct Wrapper<T: ?Sized>(std::marker::PhantomData<T>); +fn mk<T: Trait>(x: T) -> Wrapper<<T as Trait>::Assoc> { todo!() } + + +trait IsStaticStr {} +impl IsStaticStr for (&'static str,) {} +fn define<T: IsStaticStr>(_: T) {} + +fn foo<'a, T: Trait>() { + let y = Default::default(); + + // `<?0 as Trait>::Assoc <: &'a str` + // In the old solver, this would *equate* the LHS and RHS. + let _: Wrapper<&'a str> = mk(y); + + // ... then later on, we constrain `?0 = &'static str` + // but that should not mean that `'a = 'static`, because + // we should use *sub* above. + define((y,)); +} + +fn main() {} |