lib2to3 doesn't provide a grammar where exec is a function

[elibendersky]

BPO	23896
Nosy	@gvanrossum, @benjaminp
PRs	bpo-23896: Add a grammar where exec isn't a stmt #13272

^{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 = None
closed_at = <Date 2019-05-20.20:27:49.880>
created_at = <Date 2015-04-09.13:49:42.489>
labels = ['type-bug', 'library']
title = "lib2to3 doesn't provide a grammar where exec is a function"
updated_at = <Date 2019-05-20.20:27:49.879>
user = 'https://bugs.python.org/elibendersky'

bugs.python.org fields:

activity = <Date 2019-05-20.20:27:49.879>
actor = 'gvanrossum'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-20.20:27:49.880>
closer = 'gvanrossum'
components = ['Library (Lib)']
creation = <Date 2015-04-09.13:49:42.489>
creator = 'eli.bendersky'
dependencies = []
files = []
hgrepos = []
issue_num = 23896
keywords = ['patch']
message_count = 3.0
messages = ['240326', '342949', '342951']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'benjamin.peterson', 'eli.bendersky']
pr_nums = ['13272']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue23896'
versions = ['Python 3.5', 'Python 3.6']

[elibendersky]

lib2to3 helpfully provides pygram.python_grammar_no_print_statement for parsing Python 3 ('print' has the semantics of an identifier, not a keyword)

However, the same courtesy is not extended to 'exec', which also turns from a statement to an identifier in Python 3.

I'd propose adding something like python_grammar_no_print_and_exec_statement

The name's a handful, but it's explicit and I can't think of anything else, given that we don't want to change the lib2to3 API at this time to rename these grammars using some other convention.

[gvanrossum]

New changeset 4011d86 by Guido van Rossum (Batuhan Taşkaya) in branch 'master':
bpo-23896: Add a grammar where exec isn't a stmt (bpo-13272)
4011d86

[gvanrossum]

Thanks Batuhan Taşkaya!