[Python-3000] List & set comprehensions patch

[Greg Ewing]

Nick Coghlan wrote:

> One of the comments made on Georg's initial attempt at implementing 
> these features was that it would be nice to avoid the function call 
> overhead in the listcomp & setcomp case ... I tried to do that and 
> essentially failed outright

Not having seen the code, my thought would be to temporarily
change the symtab entry so that it refers to a different
locals slot, compile the nested code with that, and then
change it back again.

Did you consider doing something like that and find that
it wouldn't work?

--
Greg