# -*- python -*-

import :std:print

unit a
unit b

def func(x=a, y=b):
    return "ab"

def func(x=a, y=a):
    return "aa"

def main(x):
    var f := func(a(1))
    print(f(a(2)))
    print(f(b(3)))
    
# EXECUTE
# aa
# ab