File: issue-53092.rs

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rustc 1.87.0%2Bdfsg1-1
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#![feature(type_alias_impl_trait)]
#![allow(dead_code)]

pub type Bug<T, U> = impl Fn(T) -> U + Copy;

#[define_opaque(Bug)]
fn make_bug<T, U: From<T>>() -> Bug<T, U> {
    |x| x.into()
    //~^ ERROR the trait bound `U: From<T>` is not satisfied
}

union Moo {
    x: Bug<u8, ()>,
    y: (),
}

const CONST_BUG: Bug<u8, ()> = unsafe { Moo { y: () }.x };

fn main() {
    CONST_BUG(0);
}