- regenerate ast.py
- add future flags for absolute-import and with-statement so they
(hopefully) properly get set in code-object flags
- try out if/else expressions in actual code for the hell of it.
Seems to generate the same kind of bytecode as the normal compiler.
Fix list comp code generation -- emit GET_ITER instead of Const(0)
after the list.
Add CO_GENERATOR flag to generators.
Get CO_xxx flags from the new module