import stdio
import testcheck


# nonlocal test: a nested function mutates an outer local
def make_counter() -> callable[[], int]:
    count: int = 0
    # Inner closure captures count
    def counter() -> int:
        nonlocal count
        count = count + 1
        return count
    return counter


def test_closure_call():
    """Verify calling a rawptr function pointer."""
    testcheck.section("Closure call via rawptr")
    f: callable[[], int] = make_counter()
    v: int = f()
    testcheck.check(v == 1, "f() first call = 1", "expect 1")
    # testcheck.check(v2 == 2, "f2() first call = 2", "expect 2")


def main() -> int:
    testcheck.begin("ClosureCallTest: rawptr function pointer call")
    test_closure_call()
    return testcheck.end()