[Octave-bug-tracker] [bug #39561] MATLAB compatibility reported incorrectly

[Tom Olin]

Follow-up Comment #2, bug #39561 (project octave):

I cobbled up this file (bug.m) exhibiting the problem, based on some real code
that originally produced the warnings. Some cases might be further reducible.


function bug()

  % example 1
  if pi > pi ...
     && pi < pi
    pi;
  end

  % example 2
  s = ['abc' ...
             'def'];

  % example 3
  v = [1 2 3 ...
         4 5 6];

  % example 4
  a = {'a', 'b', 'c', ...
       'd', 'e', 'f'};

  % example 5
  p ...
  = pi;

  % example 6
  p = pi ...
      *pi;
end


This is what it produces:


>> warning('on','Octave:matlab-incompatible');
>> bug
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 5 offile /home/test/bug.m
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 11 offile /home/test/bug.m
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 15 offile /home/test/bug.m
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 19 offile /home/test/bug.m
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 23 offile /home/test/bug.m
warning: potential Matlab compatibility problem:  used as line continuation
marker near line 27 offile /home/test/bug.m
>> 


Perhaps examples 2, 3 and 4 fall under the rule that continuation markers are
unnecessary inside parentheses? If so, then a tweak to the documentation could
clarify that. If not, then it looks like a bug.

What about examples 1, 5 and 6?

In any case, the warning's reference to a nonexistent backslash is
unnecessarily confusing and unhelpful.


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