tests/ui/inference/bivariant-param.rs

//! Regression test for <https://github.com/rust-lang/rust/issues/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.
//@ run-pass

#![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() {
}