Help: how can I get nested sub command unknown message gracefully

[xavier-hou]

For example, I have a root command with sub-command run. And sub command run have a nested sub-command test.

Suppose that my command line called foo. The problem is if I use foo set, it will print the error message unknown command "set" for "foo". But if I use a wrong command like foo run set, it will just print the usage rather than unknown sub command "set" for "run".

My question is how can I get the nested sub-command unknown message gracefully just like command?

#706

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