[Octave-bug-tracker] [bug #53871] Increment with += gives error in .m file

[John W. Eaton]

Follow-up Comment #3, bug #53871 (project octave):

Yes, this is confusing, and an unfortunate side effect of trying to provide
both the "+=" operator and also parse "count += 1" in a Matlab-compatible way.
 When the script is parsed, Octave doesn't know that count is a variable, so
that += expression is parsed as "command syntax", so it is treated as if it
were


count ("+=", "1")


Then, when the script is executed in the context where count is defined as a
variable, that indexing operation doesn't make sense.  You see 61 in the error
message because that's the ASCII code for the = character, and I think it is
just complaining about the maximum index that is out of bounds.

I'm not sure whether this would be easy to fix to work in the expected way. 
Maybe we can at least provide a more meaningful error message.





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