New submission from Serhiy Storchaka:

In dict.fromkeys() implementation when a dict is passed its size is determined 
by using the Py_SIZE macro. This is not correct since PyDictObject is not a 
PyVarObject (but see issue28988).

----------
components: Interpreter Core
messages: 289915
nosy: inada.naoki, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Misuse of Py_SIZE in dict.fromkey()
type: behavior
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29864>
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