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

from test.test_support import check_syntax

import warnings

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

def compile_and_check(text, should_fail=1):

    try:

        compile(text, "<test code>", "exec")

    except SyntaxError, msg:

        if should_fail:

            print "got SyntaxError as expected"

        else:

            print "raised unexpected SyntaxError:", text

    else:

        if should_fail:

            print "should have raised SyntaxError:", text

        else:

            print "as expected, no SyntaxError"

prog_text_1 = """

def wrong1():

    a = 1

    b = 2

    global a

    global b

"""

compile_and_check(prog_text_1)

prog_text_2 = """

def wrong2():

    print x

    global x

"""

compile_and_check(prog_text_2)

prog_text_3 = """

def wrong3():

    print x

    x = 2

    global x

"""

compile_and_check(prog_text_3)

prog_text_4 = """

global x

x = 2

"""

compile_and_check(prog_text_4, 0)