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