hai shi <shihai1...@126.com> added the comment:

> Given that tuple metavars currently doesn't work, there is no backward 
> compatibility issue.  What is being proposed is to give more friendly error 
> messages.

Got it, thanks.

> Paul suggested that it may be a better plan to just disallow tuple metavars 
> and to give a better error message as the OP suggested.  That makes sense to 
> me.

+1

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