STINNER Victor added the comment:
> I suppose you noticed you broke a bunch of buildbots :)
Failures occur on FreeBSD, OpenIndiana and some other buildbots which don't set
a locale and so use the "C" locale. main() decodes command line arguments from
the locale encoding using _Py_char2wchar(). On these OSes, the "C" locale uses
the ISO-8859-1 encoding, but the problem is that nl_langinfo(CODESET) announces
ASCII :-/ test_cmd_line.test_undecodable_code() handles this case. Extract of a
# _Py_char2wchar() decoded b'\xff' as '\xff' even if the locale is
# C and the locale encoding is ASCII. It occurs on FreeBSD, Solaris
# and Mac OS X.
Mac OS X is now using UTF-8 to decode the command line arguments.
I just created the issue #16455 to fix FreeBSD and OpenIndiana.
I propose to close this issue because I consider it as fixed (#16455 will
reenable TESTFN_UNDECODABLE in test_cmd_line_script).
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