New submission from Pierre Quentel <pierre.quen...@gmail.com>:
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 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44741> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com