more work on large moves, including the notion of linking again

lib/virtual/constants.rb

@@ -56,6 +56,10 @@ module Virtual
     def mem_length
       padded(1 + string.length)
     end
+    def set_position pos
+      puts "STRING #{pos} #{string}"
+      super
+    end
     def position
       return @position if @position
       return @string.position if @string.position

lib/virtual/object.rb

@@ -26,7 +26,10 @@ module Virtual
       @position
     end
     def set_position pos
-      raise "position set again #{pos}!=#{@position} for #{self}" if @position != nil and (@position != pos)
+      # resetting of position used to be error, but since relink and dynamic instruction size it is ok. in measures
+      if @position != nil and ((@position - pos).abs > 15)
+        raise "position set again #{pos}!=#{@position} for #{self}" 
+      end
       @position = pos
     end
     def inspect