On Mon, Jan 22, 2024 at 06:00:51PM -0500, Jeff King wrote: > then running: > > t/helper/test-tool parse-options --do > > correctly complains about the ambiguity (though amusingly it mentions > "--no-no-doubt" in the error message). And if I add KEEP_UNKNOWN_OPT, > then it gives the wrong behavior. But curiously it does so even with > your patch applied. So I think there may be further fixes needed. Oh sorry, I'm stupid. Of course it does not complain with KEEP_UNKNOWN_OPT. It treats it as unknown and keeps it! So with the patch I showed (and adding in KEEP_UNKNOWN_OPT), even without your patch "--do" is handled correctly (it is unknown and left in argv[0]). It is only "--no-do" which is broken, and your patch fixes that. Sorry for the noise. :) -Peff