stash old vm

moving on to getting mom to work and can’t have both
interpreter and elf broke, about 100 tests  went

stash/vm/tree/assignment.rb

@@ -0,0 +1,30 @@
+module Vm
+  module Tree
+
+    class Assignment < Statement
+      attr_accessor :name , :value
+
+      def initialize(name  , value = nil )
+        @name , @value = name , value
+      end
+
+      def to_s
+        "#{name} = #{value}\n"
+      end
+
+    end
+
+    class IvarAssignment < Assignment
+      def to_s
+        "@#{name} = #{value}\n"
+      end
+    end
+
+    class ArgAssignment < Assignment
+    end
+
+    class LocalAssignment < Assignment
+    end
+
+  end
+end