pub fn f() {}
pub fn f() ->  !{}

pub unsafe extern "C" fn fff<T>((a, b): (bool, i32)) -> Result<String, bool> where T: Iterator  {}

mod a {
    pub unsafe extern "C" fn fff<T>((a, b): (bool, i32)) -> Result<String, bool> where T: Iterator  {}
}

fn f(a: bool,
b: i32,
c: String) {
    let a = true;
}

fn ffff(){}