rust/src/test/run-pass/issue-2487-a.rs

class socket {
    let sock: int;

    new() { self.sock = 1; }

    drop { }

    fn set_identity()  {
        do closure || {
            setsockopt_bytes(copy self.sock)
        }
    }
}

fn closure(f: fn()) { f() }

fn setsockopt_bytes(_sock: int) { }

fn main() {}