| use std::ops::{Index, IndexMut}; | |
| struct S; | |
| struct H; | |
| impl S { | |
| fn f(&mut self) {} | |
| } | |
| impl Index<u32> for H { | |
| type Output = S; | |
| fn index(&self, index: u32) -> &S { | |
| unimplemented!() | |
| } | |
| } | |
| impl IndexMut<u32> for H { | |
| fn index_mut(&mut self, index: u32) -> &mut S { | |
| unimplemented!() | |
| } | |
| } | |
| fn main() { | |
| H["?"].f(); //~ ERROR mismatched types | |
| } |