New submission from Pierre Quentel <[email protected]>:
This code
match range(42):
case [x, *w, y]:
z = 0
sets w to a list with 40 items : the length of the subject, minus the number of
non-star subpatterns.
But this code (adapted from test_patma_186) enters an infinite loop
import collections.abc
class Seq(collections.abc.Sequence):
def __getitem__(self, i):
print('get item', i)
return i
def __len__(self):
return 42
match Seq():
case [x, *w, y]:
z = 0
__getitem__ gets called forever, instead of stopping when the expected number
of items in w is reached.
----------
components: Interpreter Core
messages: 398226
nosy: quentel
priority: normal
severity: normal
status: open
title: Pattern Matching - star subpattern with a subject derived from
collections.abc.Sequence
type: crash
versions: Python 3.10, Python 3.11
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Python tracker <[email protected]>
<https://bugs.python.org/issue44741>
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