Generators have been permanent for a while. This comment is no longer applicable.
diff --git a/Include/code.h b/Include/code.h
index 6edb054..1c8fbb3 100644
--- a/Include/code.h
+++ b/Include/code.h
@@ -39,12 +39,7 @@
call frame it setup.
*/
#define CO_NOFREE 0x0040
-/* XXX Temporary hack. Until generators are a permanent part of the
- language, we need a way for a code object to record that generators
- were *possible* when it was compiled. This is so code dynamically
- compiled *by* a code object knows whether to allow yield stmts. In
- effect, this passes on the "from __future__ import generators" state
- in effect when the code block was compiled. */
+
#define CO_GENERATOR_ALLOWED 0x1000 /* no longer used in an essential way */
#define CO_FUTURE_DIVISION 0x2000