Function is_maybe_undefined

mypyc/transform/refcount.py:92–95

(post_must_defined: set[Value], src: Value)

def is_maybe_undefined(post_must_defined: set[Value], src: Value) -> bool:
    return (isinstance(src, Register) and src not in post_must_defined) or (
        isinstance(src, CallC) and src.returns_null
    )


def maybe_append_dec_ref(