Heap closures can capture already-moved values.

[bblum]

I must say I am shocked that this program is accepted. You can imagine what happens.

fn main () {
        let x = ~"hello";
        let _y = x;
        let z: ~fn() = || { error!("%?", x); }; // program accepted with @fn or ~fn but not &fn
        z();
}

[bblum]

dup of #7444