rust/tests/ui/unboxed-closures/unboxed-closures-single-word-env.rs

// run-pass
// Ensures that single-word environments work right in unboxed closures.
// These take a different path in codegen.

fn a<F:Fn(isize, isize) -> isize>(f: F) -> isize {
    f(1, 2)
}

fn b<F:FnMut(isize, isize) -> isize>(mut f: F) -> isize {
    f(3, 4)
}

fn c<F:FnOnce(isize, isize) -> isize>(f: F) -> isize {
    f(5, 6)
}

fn main() {
    let z = 10;
    assert_eq!(a(move |x: isize, y| x + y + z), 13);
    assert_eq!(b(move |x: isize, y| x + y + z), 17);
    assert_eq!(c(move |x: isize, y| x + y + z), 21);
}