TCL is a better Scheme

This is a tail-recursive naive implementation of factorial for TCL 8.6:
proc fac-tr {n {k 1}} {
if {$n <= 1} {
return $k
} else {
tailcall fac-tr [- $n 1] [* $n $k]
}
}

>>3
Show me another language with S-exps AND tons of maintained libraries. It really doesn't matter if Clojure as a language doesn't measure up to nebulous standards of ``true LISP''. Ecosystem is important. No practical person cares about the ``LISP'' religion. The adherents of this religion are mental masturbatory retards who fellate each other on lambdatheultimate and discuss programming on a meta level because they're too fucking (or 'lazy 'retarded 'pretentious) to participate in modern computing. Just reading these peoples' comments is enough reason to abandon the cult.