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

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Follow-up Comment #6, bug #68101 (group octave):

I'm familiar with Perl which also allows a trailing comma for the last
element.  That makes sense to me.  On the other hand, I don't think ignoring a
leading comma makes sense.  The comma is a separator, and so there must have
been something that was supposed to be just before the separator.

It also leads to inconsistent parsing.  If initial commas are not significant,
then logically it should be possible to have more than one in a row.  But,
that is not what Octave's parser does.

octave:2> x = [,2,3]
x =

   2   3

octave:3> y = [,,2,3]
error: syntax error

>>> y = [,,2,3]

This seems like something worth changing, even though it will introduce an
incompatibility with Matlab.  I don't know how much Matlab code actually
relies on this parsing "feature", but we could make it a configurable option
and if *octave* is invoked with the *--traditional* argument then the parser
could behave in a Matlab-compatible way.




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