Perhaps the thing to do is keep to Python: for+ if? if you get my
pidgin-EBNF.
Separate issues:
* Paren-free heads can run into trouble:
https://mail.mozilla.org/pipermail/es-discuss/2011-September/016804.html. But
in a comprehension, the subsequent 'for', 'if', or ']' (or ')' for a
genexp) helps, so this may not be a problem in fact. We need to work
through it, though.
* We don't need to worry about ECMA-357 (E4X) for-each-in too much here.
SpiderMonkey can cope, the standard shouldn't contextually reserve
'each' or anything.
/be
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