New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:

The proposed PR refactors the code for assignment expression and removes the 
NamedStore value of the expr_context_ty enum added in issue35224. 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

----------
components: Interpreter Core
messages: 337136
nosy: emilyemorehouse, gvanrossum, serhiy.storchaka, tim.peters
priority: normal
severity: normal
status: open
title: Get rid of NamedStore
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36187>
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