+= operator strangeness in octave 4.4 build

[Richard Kirk]

Hi.

I have a 4.4 source build on CenoOS 6.5. This took a bit of getting to 
work, but it all seems to be up and running with one mysterious exception.

I make a local file "dummy.m" with just 3 lines...
# Increment count

count += 1;

I now try to use it to increment 'count'...

octave:1> count = 0;
octave:2> count += 1;
octave:3> count
count =  1

Okay, that worked. Now let's do that by calling dummy.m...

octave:4> dummy
error: count(61,_): but count has size 1x1
error: called from
    dummy at line 3 column 1

If I replace count += 1; with ++count; in dummy.m then it works.That is 
my workaround, and I am fine with that for now. However, it used to work 
in 3.4.3.

Does anyone else see this, or have I mucked up my build somehow? If it 
is real, I can file a bug.

Thanks
Richard Kirk