Method needs_defining

Tools/cases_generator/stack.py:450–456

(var: Local)

    @staticmethod
    def needs_defining(var: Local) -> bool:
        return (
            not var.item.peek and
            not var.in_local and
            not var.is_array() and
            var.name != "unused"
        )

    @staticmethod
    def is_live(var: Local) -> bool: