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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/traits/infer-from-object-issue-26952.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 '')
-rw-r--r-- | src/test/ui/traits/infer-from-object-issue-26952.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/traits/infer-from-object-issue-26952.rs b/src/test/ui/traits/infer-from-object-issue-26952.rs new file mode 100644 index 000000000..ed258dbb2 --- /dev/null +++ b/src/test/ui/traits/infer-from-object-issue-26952.rs @@ -0,0 +1,26 @@ +// run-pass +#![allow(dead_code)] +#![allow(unused_variables)] +// Test that when we match a trait reference like `Foo<A>: Foo<_#0t>`, +// we unify with `_#0t` with `A`. In this code, if we failed to do +// that, then you get an unconstrained type-variable in `call`. +// +// Also serves as a regression test for issue #26952, though the test +// was derived from another reported regression with the same cause. + +use std::marker::PhantomData; + +trait Trait<A> { fn foo(&self); } + +struct Type<A> { a: PhantomData<A> } + +fn as_trait<A>(t: &Type<A>) -> &dyn Trait<A> { loop { } } + +fn want<A,T:Trait<A>+?Sized>(t: &T) { } + +fn call<A>(p: Type<A>) { + let q = as_trait(&p); + want(q); // parameter A to `want` *would* be unconstrained +} + +fn main() { } |