Get rid of NamedStore

[serhiy-storchaka]

BPO	36187
Nosy	@gvanrossum, @tim-one, @serhiy-storchaka, @MojoVampire, @emilyemorehouse
PRs	bpo-36187: Remove NamedStore. #12167

^{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 2019-03-05.18:57:36.405>
created_at = <Date 2019-03-04.16:10:00.443>
labels = ['interpreter-core', '3.8']
title = 'Get rid of NamedStore'
updated_at = <Date 2019-03-05.18:57:36.405>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2019-03-05.18:57:36.405>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-05.18:57:36.405>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2019-03-04.16:10:00.443>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 36187
keywords = ['patch']
message_count = 2.0
messages = ['337136', '337236']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'tim.peters', 'serhiy.storchaka', 'josh.r', 'emilyemorehouse']
pr_nums = ['12167']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36187'
versions = ['Python 3.8']

[serhiy-storchaka]

The proposed PR refactors the code for assignment expression and removes the NamedStore value of the expr_context_ty enum added in bpo-35224. This value is undistinguished from Store except two places in Python/ast.c and Python/symtable.c, but in that cases the difference can be handled at one level upper (when process the NamedExpr expression).

As a side effect this PR fixes the following minor bug:

>>> (True := 1)
  File "<stdin>", line 1
SyntaxError: cannot delete True

[serhiy-storchaka]

New changeset d8b3a98 by Serhiy Storchaka in branch 'master':
bpo-36187: Remove NamedStore. (GH-12167)
d8b3a98