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trait Mirror { type Me; } impl<T> Mirror for T { type Me = T; } trait Foo<'a> { const C: <&'a u32 as Mirror>::Me; } impl<'a, T> Foo<'a> for T { const C: &'a u32 = &22; } fn foo<'a>(_: &'a u32) -> &'static u32 { <() as Foo<'a>>::C //~ ERROR } fn main() { }