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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-41677.rs | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-41677.rs b/src/test/ui/issues/issue-41677.rs new file mode 100644 index 000000000..afddbc799 --- /dev/null +++ b/src/test/ui/issues/issue-41677.rs @@ -0,0 +1,28 @@ +// run-pass +// Regression test for #41677. The local variable was winding up with +// a type `Receiver<?T, H>` where `?T` was unconstrained, because we +// failed to enforce the WF obligations and `?T` is a bivariant type +// parameter position. + +#![allow(unused_variables, dead_code)] + +use std::marker::PhantomData; + +trait Handle { + type Inner; +} + +struct ResizingHandle<H>(PhantomData<H>); +impl<H> Handle for ResizingHandle<H> { + type Inner = H; +} + +struct Receiver<T, H: Handle<Inner=T>>(PhantomData<H>); + +fn channel<T>(size: usize) -> Receiver<T, ResizingHandle<T>> { + let rx = Receiver(PhantomData); + rx +} + +fn main() { +} |