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+ // compile-pass
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+
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+ // `std::ops::Index` has an `: ?Sized` bound on the `Idx` type param. This is
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+ // an accidental left-over from the times when it `Index` was by-reference.
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+ // Tightening the bound now could be a breaking change. Although no crater
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+ // regression were observed (https://github.com/rust-lang/rust/pull/59527),
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+ // let's be conservative and just add a test for this.
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+ #![ feature( unsized_locals) ]
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+
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+ use std:: ops;
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+
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+ pub struct A ;
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+
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+ impl ops:: Index < str > for A {
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+ type Output = ( ) ;
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+ fn index ( & self , _: str ) -> & Self :: Output { panic ! ( ) }
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+ }
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+
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+ impl ops:: IndexMut < str > for A {
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+ fn index_mut ( & mut self , _: str ) -> & mut Self :: Output { panic ! ( ) }
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+ }
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+
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+ fn main ( ) { }
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