rust/tests/ui/issues/issue-41742.rs

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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
}