File: arbitrary-self-opaque.rs

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rustc 1.88.0%2Bdfsg1-1
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#![feature(type_alias_impl_trait)]
struct Foo;

type Bar = impl Sized;

impl Foo {
    #[define_opaque(Bar)]
    fn foo(self: Bar) {}
    //~^ ERROR: invalid `self` parameter type: `Bar`
    //~| ERROR: item does not constrain
}

fn main() {}