just make sre we really ret registers (some constants were flying about)

lib/register/instruction.rb

@@ -26,6 +26,11 @@ module Register
       raise "abstract called for #{self.class}"
     end
 
+    # wrap symbols into regsiter reference if needed
+    def wrap_register reg
+      return reg if reg.is_a? RegisterReference
+      RegisterReference.new(reg)
+    end
   end
   
 end

lib/register/instructions/register_transfer.rb

@@ -4,8 +4,8 @@ module Register
 
   class RegisterTransfer < Instruction
     def initialize from , to
-      @from = from
+      @from = wrap_register(from)
-      @to = to
+      @to = wrap_register(to)
     end
     attr_reader :from, :to
   end