Add all the A tasks

Task/Anonymous-recursion/Tcl/anonymous-recursion-4.tcl

@@ -0,0 +1,8 @@
+# Pick the lambda term out of the introspected caller's stack frame
+proc tcl::mathfunc::recurse args {apply [lindex [info level -1] 1] {*}$args}
+proc fib n {
+    if {[incr n 0] < 0} {error "argument may not be negative"}
+    apply {x {expr {
+        $x < 2 ? $x : recurse([incr x -1]) + recurse([incr x -1])
+    }}} $n
+}