Add all the A tasks

Task/Anonymous-recursion/Ruby/anonymous-recursion-7.rb

@@ -0,0 +1,32 @@
+require 'continuation' unless defined? Continuation
+
+module Kernel
+  module_function
+
+  def function(&block)
+    f = (proc do |*args|
+           (class << args; self; end).class_eval do
+             define_method(:callee) { f }
+           end
+           ret = nil
+           cont = catch(:function) { ret = block.call(*args); nil }
+           cont[args] if cont
+           ret
+         end)
+  end
+
+  def arguments
+    callcc { |cont| throw(:function, cont) }
+  end
+end
+
+def fib(n)
+  raise RangeError, "fib of negative" if n < 0
+  function { |m|
+    if m < 2
+      m
+    else
+      arguments.callee[m - 1] + arguments.callee[m - 2]
+    end
+  }[n]
+end