Other situations like this (was RE: [Python-Dev] Nested scopes resolution -- you can breathe again!)

[Jeremy Hylton]

Couple of issues the come to mind about __future__:

1 Should this work?

if x:
    from __future__ import nested_scopes

I presume not, but the sketch of the rules you posted earlier
presumably allow it.

2. How should the interactive interpreter be handled?

I presume if you type
>>> from __future__ import nested_scopes

That everything thereafter will be compiled with nested scopes.  This
ends up being a little tricky, because the interpreter has to hang
onto this information and tell the compiler about it.

Jeremy