rust/tests/ui/lifetimes/issue-79187-2.rs
2023-01-11 09:32:08 +00:00

30 lines
670 B
Rust

trait Foo {}
impl<F> Foo for F where F: Fn(&i32) -> &i32 {}
fn take_foo(_: impl Foo) {}
fn main() {
take_foo(|a| a);
//~^ ERROR implementation of `FnOnce` is not general enough
//~| ERROR mismatched types
take_foo(|a: &i32| a);
//~^ ERROR lifetime may not live long enough
//~| ERROR mismatched types
take_foo(|a: &i32| -> &i32 { a });
//~^ ERROR lifetime may not live long enough
//~| ERROR mismatched types
// OK
take_foo(identity(|a| a));
take_foo(identity(|a: &i32| a));
take_foo(identity(|a: &i32| -> &i32 { a }));
fn identity<F>(t: F) -> F
where
F: Fn(&i32) -> &i32,
{
t
}
}