2to3 should translate itertools.imap into generator expression, not list comprehension

[dangyogi]

BPO	2427
Nosy	@rhettinger, @wolever

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/wolever'
closed_at = <Date 2008-03-20.00:10:53.202>
created_at = <Date 2008-03-19.19:34:53.913>
labels = ['type-bug', 'expert-2to3']
title = '2to3 should translate itertools.imap into generator expression, not list comprehension'
updated_at = <Date 2008-03-20.00:15:37.031>
user = 'https://bugs.python.org/dangyogi'

bugs.python.org fields:

activity = <Date 2008-03-20.00:15:37.031>
actor = 'rhettinger'
assignee = 'wolever'
closed = True
closed_date = <Date 2008-03-20.00:10:53.202>
closer = 'wolever'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2008-03-19.19:34:53.913>
creator = 'dangyogi'
dependencies = []
files = []
hgrepos = []
issue_num = 2427
keywords = []
message_count = 5.0
messages = ['64092', '64094', '64114', '64130', '64131']
nosy_count = 4.0
nosy_names = ['collinwinter', 'rhettinger', 'dangyogi', 'wolever']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue2427'
versions = ['Python 2.6']

[dangyogi]

2to3, svn rev 61623 translates itertools.imap(lambda x: ..., ...) into a
list comprehension. This should be translated instead into a generator
expression so that doing itertools.imap on infinite iterators still works.

[rhettinger]

Why isn't itertools.imap() being translated directly to builtins.map()?

[wolever]

itertools.imap is being translated directly to map... But I bet this is
another one of those ordering problems -- itertools.imap is converted to
the map, then the map is converted to list(map(...)) because fix_map
doesn't know that map was already fixed.

[wolever]

Ok, I've added explicit ordering to fixers in r61654, fixing this issue.

[rhettinger]

Thanks David.