[Octave-bug-tracker] [bug #53871] In-place increment of a workspace variable with += in a script issues error

[Rik]

Update of bug #53871 (project octave):

                Category:                    None => Interpreter            
                Priority:              5 - Normal => 3 - Low                
              Item Group:                    None => Unexpected Error       
                  Status:                    None => Confirmed              
                 Summary: Increment with += gives error in .m file => In-place
increment of a workspace variable with += in a script issues error

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Follow-up Comment #6:

Confirmed.

jwe's analysis from comment #3 looks accurate.  As a way to test it, I made
count a global variable both at the command line,


global count
count = 0

, and in dummy.m


global count
count += 1


This works because when parsing dummy.m the "global" modifier signals to the
parser that count is a variable and not a function call.

You can trick the parser in to recognizing that count is a variable by using
self-assignemnt in dummy.m.


count = count;
count += 1


That is really weird though.  You are probably better off just using


count = count + 1;


for the time being.

I'm lowering the priority since there are lots of work arounds.


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