tests/ui/closures/closure-mut-argument-6153.rs


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// https://github.com/rust-lang/rust/issues/6153
//@ run-pass

fn swap<F>(f: F) -> Vec<isize> where F: FnOnce(Vec<isize>) -> Vec<isize> {
    let x = vec![1, 2, 3];
    f(x)
}

pub fn main() {
    let v = swap(|mut x| { x.push(4); x });
    let w = swap(|mut x| { x.push(4); x });
    assert_eq!(v, w);
}