commit ad5e8520f3e117f45481513014548a39879d30d2Author: Antony Lee <anntzer.lee@gmail.com>Date:   Sun May 1 08:04:50 2022 +0200    bpo-39716: Raise on conflicting subparser names. (GH-18605)    Raise an ArgumentError when the same subparser name is added twice to an    ArgumentParser.  This is consistent with the (default) behavior when the    same option string is added twice to an ArgumentParser.    (Support for `conflict_handler="resolve"` could be considered as a    followup feature, although real use cases seem even rarer than    "resolve"ing option-strings.)    Automerge-Triggered-By: GH:rhettinger

@@            Coverage Diff             @@##             main    #2014      +/-   ##==========================================- Coverage   92.65%   92.62%   -0.04%==========================================  Files          78       78                Lines        4944     4949       +5     ==========================================+ Hits         4581     4584       +3- Misses        363      365       +2