rust/tests/ui/parser/issues/issue-22647.rs

fn main() {
    let caller<F> = |f: F|  //~ ERROR generic args in patterns require the turbofish syntax
    where F: Fn() -> i32
    {
        let x = f();
        println!("Y {}",x);
        return x;
    };

    caller(bar_handler);
}

fn bar_handler() -> i32 {
    5
}