[Octave-bug-tracker] [bug #53331] Can't make function output argument persistent (poor man's constant)

[Mike Miller]

Follow-up Comment #4, bug #53331 (project octave):

I don't fully understand the underlying reasons either, but I guess that it
may be described by jwe's comment

> I would prefer that we disallow making existing variables (including
function parameters) global the same as we do for persistent

IOW, when the function definition is parsed, the output parameters are already
"defined" in some sense as local variables? So then having a "persistent"
statement overriding the output argument declaration is conflicting somehow.

And here is a quote from the Matlab official docs

> MATLAB also errors if you declare any of a function's input or output
arguments as persistent within that same function

I think it would be helpful if this were mentioned in our docs, along with an
example showing the correct way to do it.

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