> I've read the documentation (so I understand f.e. the difference between
> %rec and $rec), but I didn't find anything about how to change the
> parameters type.

Ah, your macro enters a territory badly covered by the docs: creating a
local variable with the name of a parameter... Dunno why it behaves the way
it does, or why the +0 helps, though. At least it is not because of the
MegaPOV: I tried it in 3.1g and it did the exact same thing. An easy thing
to fix, though. Just use

    #local new_pos = ...

and later

    tree(new_pos...

Yours,

  - Nikodemus Siivola

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