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29 lines
634 B
Rust
29 lines
634 B
Rust
//@ run-pass
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// Regression test for #41677. The local variable was winding up with
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// a type `Receiver<?T, H>` where `?T` was unconstrained, because we
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// failed to enforce the WF obligations and `?T` is a bivariant type
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// parameter position.
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#![allow(unused_variables, dead_code)]
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use std::marker::PhantomData;
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trait Handle {
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type Inner;
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}
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struct ResizingHandle<H>(PhantomData<H>);
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impl<H> Handle for ResizingHandle<H> {
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type Inner = H;
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}
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struct Receiver<T, H: Handle<Inner=T>>(PhantomData<H>);
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fn channel<T>(size: usize) -> Receiver<T, ResizingHandle<T>> {
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let rx = Receiver(PhantomData);
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rx
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}
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fn main() {
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}
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