Add all the A tasks

Task/Anonymous-recursion/Tcl/anonymous-recursion-1.tcl

@@ -0,0 +1,10 @@
+proc fib n {
+    # sanity checks
+    if {[incr n 0] < 0} {error "argument may not be negative"}
+    apply {x {
+	if {$x < 2} {return $x}
+	# Extract the lambda term from the stack introspector for brevity
+	set f [lindex [info level 0] 1]
+	expr {[apply $f [incr x -1]] + [apply $f [incr x -1]]}
+    }} $n
+}