Checkpoint. 218 tests are okay; 53 are failing. Done so far:

- all classes are new-style (but ripping out classobject.[ch] isn't done)
- int/int -> float
- all exceptions must derive from BaseException
- absolute import
- 'as' and 'with' are keywords

Python/pythonrun.c

@@ -696,9 +696,7 @@ PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flag
 /* compute parser flags based on compiler flags */
 #define PARSER_FLAGS(flags) \
 	((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \
-		      PyPARSE_DONT_IMPLY_DEDENT : 0) \
-		    | ((flags)->cf_flags & CO_FUTURE_WITH_STATEMENT ? \
-		       PyPARSE_WITH_IS_KEYWORD : 0)) : 0)
+		      PyPARSE_DONT_IMPLY_DEDENT : 0)) : 0)
 
 int
 PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)