Ken Jin <kenjin4...@gmail.com> added the comment:
I'm unable to reproduce it on 3.10:
>>> regass = lambda k: k in {None}
>>> dis.dis(regass)
1 0 LOAD_FAST 0 (k)
2 LOAD_CONST 1 (frozenset({None}))
4 CONTAINS_OP 0
6 RETURN_VALUE
>>> dis.dis(walrus:=lambda k: k in {None})
1 0 LOAD_FAST 0 (k)
2 LOAD_CONST 1 (frozenset({None}))
4 CONTAINS_OP 0
6 RETURN_VALUE
On 3.9 and 3.8, I'm able to reproduce your bug.
----------
nosy: +kj
versions: -Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43947>
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