tickling lisp

[Peter L. Peres]

I have a problem that stumps me. I need to flatten a list that can be
complex, in tcl. I need to test the head for being a list. I can't ?

It turns out it is *very* hard to make a test in tcl that decides whether
"{a}" and "a" are the same. F.ex. [concat {a}] returns {a} (!!!). Worse,
[llength {a}] == [llength a] = 1. Huh ? a is not a list! I can't do
arithmetics on it either, my variables are pure symbols.

So how please do I find out if it's a list or an atom ?! Or am I missing
something ?

tia ?

Peter
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