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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-50687-ice-on-borrow.rs | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-50687-ice-on-borrow.rs b/src/test/ui/issues/issue-50687-ice-on-borrow.rs new file mode 100644 index 000000000..7a8a12c2a --- /dev/null +++ b/src/test/ui/issues/issue-50687-ice-on-borrow.rs @@ -0,0 +1,41 @@ +// 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 +} |