transformations according to todays post

lib/kernel/system.rb

@@ -0,0 +1,10 @@
+module Crystal
+  module Kernel
+    def self.exit context
+      function = Vm::Function.new(:exit , Vm::Integer , [] )
+      ret = Vm::RegisterMachine.instance.exit(function)
+      function.set_return ret
+      function
+    end
+  end
+end