# ============================================================
# Cross-module isinstance test library: classes defined here are imported by
# main.vp to verify vtable comparison resolves across object files.
# ============================================================
class Shape:
    def area(self) -> int:
        return 0


virtual class Circle(Shape):
    r: int

    def __init__(self, r: int):
        self.r = r

    def area(self) -> int:
        return self.r


virtual class Square(Shape):
    s: int

    def __init__(self, s: int):
        self.s = s

    def area(self) -> int:
        return self.s


novirtual class PlainShape:
    tag: int