- Finally fixed the bug in compile() and exec where a string ending

with an indented code block but no newline would raise SyntaxError.
  This would have been a four-line change in parsetok.c...  Except
  codeop.py depends on this behavior, so a compilation flag had to be
  invented that causes the tokenizer to revert to the old behavior;
  this required extra changes to 2 .h files, 2 .c files, and 2 .py
  files.  (Fixes SF bug #501622.)

Python/bltinmodule.c

@@ -380,7 +380,9 @@ builtin_compile(PyObject *self, PyObject *args)
 		return NULL;
 	}
 
-	if (supplied_flags & ~(PyCF_MASK | PyCF_MASK_OBSOLETE)) {
+	if (supplied_flags &
+	    ~(PyCF_MASK | PyCF_MASK_OBSOLETE | PyCF_DONT_IMPLY_DEDENT))
+	{
 		PyErr_SetString(PyExc_ValueError,
 				"compile(): unrecognised flags");
 		return NULL;