| #![feature(rustc_attrs)] | |
| fn main() { #![rustc_error] // rust-lang/rust#49855 | |
| let mut x = "foo"; | |
| let y = &mut x; | |
| let z = &mut x; //~ ERROR cannot borrow | |
| z.use_mut(); | |
| y.use_mut(); | |
| } | |
| trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } } | |
| impl<T> Fake for T { } |