// error-pattern:Tried to deinitialize a variable declared in a different
fn force(f: block() -> int) -> int { ret f(); }
fn main() {
    let x = @{x: 17, y: 2};
    let y = @{x: 5, y: 5};

    let f = {|i| log_err i; x <- y; ret 7; };
    assert (f(5) == 7);
    log_err x;
    log_err y;
}