rust/tests/ui/unboxed-closures/unboxed-closures-monomorphization.rs

//@ run-pass
// Test that unboxed closures in contexts with free type parameters
// monomorphize correctly (issue #16791)

fn main(){
    fn bar<'a, T:Clone+'a> (t: T) -> Box<dyn FnMut()->T + 'a> {
        Box::new(move || t.clone())
    }

    let mut f = bar(42_u32);
    assert_eq!(f(), 42);

    let mut f = bar("forty-two");
    assert_eq!(f(), "forty-two");

    let x = 42_u32;
    let mut f = bar(&x);
    assert_eq!(f(), &x);

    #[derive(Clone, Copy, Debug, PartialEq)]
    struct Foo(usize, &'static str);

    let x = Foo(42, "forty-two");
    let mut f = bar(x);
    assert_eq!(f(), x);
}