Patch #750595: Refer to type complex using builtin. Fixes #595837.

Backported to 2.2.

Lib/copy_reg.py

@@ -28,10 +28,16 @@ def constructor(object):
 
 # Example: provide pickling support for complex numbers.
 
-def pickle_complex(c):
+try:
+    complex
+except NameError:
+    pass
+else:
+
+    def pickle_complex(c):
         return complex, (c.real, c.imag)
 
-pickle(type(1j), pickle_complex, complex)
+    pickle(complex, pickle_complex, complex)
 
 # Support for pickling new-style objects