rust/tests/compile-fail/eta.rs

#![feature(plugin)]
#![plugin(clippy)]
#![allow(unknown_lints, unused)]
#![deny(redundant_closure)]

fn main() {
    let a = Some(1u8).map(|a| foo(a));
    //~^ ERROR redundant closure found. Consider using `foo` in its place
    meta(|a| foo(a));
    //~^ ERROR redundant closure found. Consider using `foo` in its place
    let c = Some(1u8).map(|a| {1+2; foo}(a));
    //~^ ERROR redundant closure found. Consider using `{ 1 + 2; foo }` in its place
    let d = Some(1u8).map(|a| foo((|b| foo2(b))(a))); //is adjusted?
    all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
}

fn meta<F>(f: F) where F: Fn(u8) {
    f(1u8)
}

fn foo(_: u8) {

}

fn foo2(_: u8) -> u8 {
    1u8
}

fn all<X, F>(x: &[X], y: &X, f: F) -> bool
where F: Fn(&X, &X) -> bool {
    x.iter().all(|e| f(e, y))
}

fn below(x: &u8, y: &u8) -> bool { x < y }