rust/tests/ui/higher-ranked/higher-ranked-lifetime-error.rs

15 lines
217 B
Rust

fn assert_all<F, T>(_f: F)
where
F: FnMut(&String) -> T,
{
}
fn id(x: &String) -> &String {
x
}
fn main() {
assert_all::<_, &String>(id);
//~^ ERROR implementation of `FnMut` is not general enough
}