R. David Murray added the comment:

If I'm interpreted what the OP wrote correctly, he wanted the help text to not 
show that the option takes an argument, but instead rely on the help text to 
show that.  That works for the option text, but it doesn't work for the 
synopsis (the synopsis is just wrong in that case).

Probably a blank metavar should just be rejected because of the issue with they 
synopsis.  That should only be done in 3.7 if we do it, though.

Perhaps the OP will respond to explain the blank-metavar use case in more 


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