[bug #68529] A if ... elseif syntax error not flagged.

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Follow-up Comment #7, bug #68529 (group octave):

I tried:

octave:7> ver
----------------------------------------------------------------------
GNU Octave Version: 9.1.1 (hg id: 35ac89ffcf7c)
GNU Octave License: GNU General Public License
Operating System: Linux 7.1.6-201.fc44.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Aug
4 00:23:39 UTC 2026 x86_64
----------------------------------------------------------------------
no packages installed.
octave:8> a=1;
if
  a==1;
  a=2;
end
error: parse error:

  syntax error

>>> if
      ^
error: parse error:

  syntax error

>>> end
      ^
octave:11> a=1; clear b;  if  a==1, elseif, b=1, end; 
warning: suggest parenthesis around assignment used as truth value
octave:12> 


In any case I think I have a fix. I need to do a few more tests.

Dmitri.
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