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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
commit | 631cd5845e8de329d0e227aaa707d7ea228b8f8f (patch) | |
tree | a1b87c8f8cad01cf18f7c5f57a08f102771ed303 /tests/ui/traits/new-solver/alias-sub.rs | |
parent | Adding debian version 1.69.0+dfsg1-1. (diff) | |
download | rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.tar.xz rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.zip |
Merging upstream version 1.70.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/traits/new-solver/alias-sub.rs')
-rw-r--r-- | tests/ui/traits/new-solver/alias-sub.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/alias-sub.rs b/tests/ui/traits/new-solver/alias-sub.rs new file mode 100644 index 000000000..30c1981a9 --- /dev/null +++ b/tests/ui/traits/new-solver/alias-sub.rs @@ -0,0 +1,34 @@ +// compile-flags: -Ztrait-solver=next +// 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() {} |