laben

multi sub HYPER(&operator, Iterable:D \left, Iterable:D \right, :$dwim-left, :$dwim-right) {
    my @result;

    my \lefti  :=  left.iterator;
    my \righti :=  right.iterator;

    # Check whether any side is lazy. They must not be to proceed.
    if lefti.is-lazy {
        X::HyperOp::Infinite.new(:side<both>, :&operator).throw if righti.is-lazy;
        X::HyperOp::Infinite.new(:side<left>, :&operator).throw;