Can't spawn a temporary closure

[brson]

This doesn't valgrind:

fn f() {
}

fn main() {
    task::spawn(bind f());
}

This does:

fn f() {
}

fn main() {
    let g = f;
    task::spawn(g);
}

[brson]

This is actually about re-moving temporary closures. Reduced test case:

fn f2(-thing: fn()) { }

fn f(-thing: fn()) { f2(thing); }

fn main() {
    f(fn(){});
}