Posted to tcl by kbk at Mon May 04 14:30:21 GMT 2009view pretty

puts [apply {{f a} {tailcall {*}$f $f 1 $a}} {apply {{f a x} {
    if {$x == 0} {
	set a
    } else {
	tailcall {*}$f $f [expr {$a * $x}] [expr {$x - 1}]
    }
}}} 6]