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

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Follow-up Comment #3, bug #68101 (group octave):


> Current behavior is compatible with Matlab.
Is that bug-for-bug compatibility then, and is it documented Matlab behavior?

I´d say it is at least unexpected behavior; Arun's comment #0 clearly
exemplifies that.
It can even be seen as inconsistent; a missing tilde between consecutive
commas is flagged as an error, but not a missing tilde before a comma.  OTOH a
missing tilde after the last commas is OK.

Consider the following function:

function [a, b, c, d] = testfun
  a = 1;
  b = 2;
  c = 3;
  d = 4;
endfunction

called as follows:

octave:2> [~,b,c,d] = testfun
b = 2
c = 3
d = 4
octave:3> [,b,c,d] = testfun
b = 1
c = 2
d = 3
octave:4> [~,b,~,d] = testfun
b = 2
d = 4
octave:5> [~,b,,d] = testfun
error: syntax error

>>> [~,b,,d] = testfun
         ^
octave:6> [~,b,c,] = testfun
b = 2
c = 3




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