i'm running this on master, and it seems like an error to not check that the second target exists (it doesn't) -- does this repro for anyone and is this a known issue / a feature?

> ./pants test tests/python/pants_test/option:a
# ...
ResolveError: "a" was not found in namespace "tests/python/pants_test/option". Did you mean one of:
          :options_integration
          :testing
> ./pants test tests/python/pants_test/option:{testing,a}
# ...
 ===== 158 passed, 1 xfailed in 2.77 seconds ======
                     
                   tests/python/pants_test/option:testing                                          .....   SUCCESS
23:25:48 00:12     [junit]
23:25:48 00:12     [go]
23:25:48 00:12     [node]
               Waiting for background workers to finish.
23:25:49 00:13   [complete]
               SUCCESS

Repros for me and that's definitely a bug.

probably introduced in https://github.com/pantsbuild/pants/pull/6366, which was fixing a separate bug.

i’m not having a great time right now but expect to be able to get to it today, let me know if anyone else wants to take it. i’m pretty confident i can do this today though

Filing would be more than enough. And no rush!