"""Verify that warnings are issued for global statements following use."""

from test.test_support import run_unittest, check_syntax_error

import unittest

import warnings

warnings.filterwarnings("error", module="<test string>")

class GlobalTests(unittest.TestCase):

    def test1(self):

        prog_text_1 = """\

def wrong1():

    a = 1

    b = 2

    global a

    global b

"""

        check_syntax_error(self, prog_text_1)

    def test2(self):

        prog_text_2 = """\

def wrong2():

    print x

    global x

"""

        check_syntax_error(self, prog_text_2)

    def test3(self):

        prog_text_3 = """\

def wrong3():

    print x

    x = 2

    global x

"""

        check_syntax_error(self, prog_text_3)

    def test4(self):

        prog_text_4 = """\

global x

x = 2

"""

        # this should work

        compile(prog_text_4, "<test string>", "exec")

def test_main():

    run_unittest(GlobalTests)

if __name__ == "__main__":

    test_main()