Issue #14987: Add a missing import statement

Lib/inspect.py

@@ -38,6 +38,7 @@ import re
 import sys
 import tokenize
 import types
+import warnings
 from operator import attrgetter
 from collections import namedtuple
 

Misc/NEWS

@@ -10,6 +10,8 @@ What's New in Python 3.3.0 Beta 1?
 Library
 -------
 
+- Issue #14987: Add a missing import statement to inspect.
+
 - Issue #1079: email.header.decode_header now correctly parses all the examples
   in RFC2047.  There is a necessary visible behavior change: the leading and/or
   trailing whitespace on ASCII parts is now preserved.