File: issue-40085.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ run-pass
use std::ops::Index;
fn bar() {}
static UNIT: () = ();
struct S;
impl Index<fn()> for S {
    type Output = ();
    fn index(&self, _: fn()) -> &() { &UNIT }
}
fn main() {
    S.index(bar);
    S[bar];
}