[bug #68101] Missed error with missing tilde in function output

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Follow-up Comment #12, bug #68101 (group octave):

My personal opinion would be to change Octave's parser to emit an
error/warning for

[,a, b] = ...

While a Matlab user could write that code, they could just as easily write the
much clearer version

[a, b] = ...

This latter code will run under either Matlab or Octave so there is no issue
of compatibility and forcing a user to pick an interpreter for their scripts.

First, on a practical note, I doubt this construct is being used intentionally
so I think the number of scripts that would require modifying is very small.

But, if there was still anxiety about making this change then I would have the
parser recognize this feature and issue a warning with a specific warning ID.
For Matlab users who start *octave* with the *--traditional* argument this
warning ID could be disabled.  For ordinary Octave users the warning would be
printed, and could even be made an error with *warning ('error', ID)* in a
configuration file for those who really reject this syntax.



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