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[Bug argparse/22939] unintended change of getopt_long_only error message breaks third party tests


https://sourceware.org/bugzilla/show_bug.cgi?id=22939

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
On the other hand, the new message follows the spelling of the argument:

$ getopt -a -n TEST -o 'a,b,c' -l 'caa:,cba:' -- --c='AAA'
TEST: option '--c=AAA' is ambiguous; possibilities: '--caa' '--cba'

-caa is a completion of -c and --caa is a completion of --c, but not the other
way round.

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