I see

    if S has SetCategory then

      output(n, x) ==
        (not(n>0))or empty? x => void()
        mathPrint(frst(x)::OUT)$Lisp
        output(n-1, rst x)

in mathPrint in stream.spad.pamphlet.

https://github.com/hemmecke/fricas-svn/blob/master/src/algebra/stream.spad.pamphlet#L1069

However, I couldn't find any usage of that function in the library.

Of course, I don't like the mathPrint there. Wouldn't it be better
instead of

  output : (I, %) -> Void

to have

  output : (I, %) -> OutputForm

and define

  output(n: Integer, x: %): OutputForm ==

via (a modified version of) streamCountCoerce.

https://github.com/hemmecke/fricas-svn/blob/master/src/algebra/stream.spad.pamphlet#L697

Ralf

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