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// This previously caused an ICE at:
// librustc/traits/structural_impls.rs:180: impossible case reached
#![no_main]
use std::borrow::Borrow;
use std::io;
use std::io::Write;
trait Constraint {}
struct Container<T> {
t: T,
}
struct Borrowed;
struct Owned;
impl<'a, T> Write for &'a Container<T>
where
T: Constraint,
&'a T: Write,
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl Borrow<Borrowed> for Owned {
fn borrow(&self) -> &Borrowed {
&Borrowed
}
}
fn func(owned: Owned) {
let _: () = Borrow::borrow(&owned); //~ ERROR mismatched types
}
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