I think that the first paragraph that you quoted is talking about when you
call the macro like the following:

#declare X = 1;
Macro(X+50)

In this case, a new local symbol is created and no value is returned.  I
haven't read the documentation yet, so it may not be clear on this point.

-Nathan Kopp

Friedemann Schmidt wrote:
> 
> Sorry, I posted without reading the whole page of the documentation.
> The paragraph "Returning Values Via Parameters" says, that it is
> correct when the identifier with which the macro was called changes to
> a new value. But I think this is a contradiction to the quoted
> paragraph, isn't it?
>

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