> How can it be wrong when his macro is not returning anything ?
> (Note that he is using #local instead of #declare.)

2.2.2.8.5 explains it a bit, if an identifier is passed to a
macro then that identifier is in scope and #local will
modify that identifier's value.

The return-by-parameter bug is more apparent in loops,
sometimes the modified value of a parameter isn't returned,
but that's less than 1% of the time, and it's fixed in 3.7 :-)

Try this test code to convince yourself that #local in
a macro can modify a parameter value.

#macro TEST(A)
   #local A = A + 1;
#end

#declare B = 1;

TEST(B)

text { // the answer is 2
   ttf "timrom.ttf",
   concat("B = ", str(B,0,0)), 0.1,0
   pigment {rgb <0,1,0>}
   finish {ambient 1}
   translate <-1,-0.2,2>
}

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