diff --git a/lib/risc/builder.rb b/lib/risc/builder.rb
index 0cb9dc58..c161e490 100644
--- a/lib/risc/builder.rb
+++ b/lib/risc/builder.rb
@@ -2,6 +2,8 @@ module Risc
 
   class Builder
 
+    attr_reader :built
+
     def initialize(compiler)
       @compiler = compiler
     end
@@ -11,15 +13,28 @@ module Risc
       name = args[0].to_s.capitalize.to_sym
       type = Risc.resolve_type(name , @compiler)
       reg = @compiler.use_reg( type )
+      reg.builder = self
       puts reg
       reg
     end
+    def build(&block)
+      instance_eval(&block)
+      return built
+    end
+    def add_instruction(ins)
+      if(built)
+        built << ins
+      else
+        @built = ins
+      end
+    end
   end
 
   class RValue
   end
+
   def self.build(compiler, &block)
-    Builder.new(compiler).instance_eval( &block )
+    Builder.new(compiler).build( &block )
   end
 
   # if a symbol is given, it may be the message or the new_message.
diff --git a/lib/risc/risc_value.rb b/lib/risc/risc_value.rb
index 9c38a9f1..ab74627e 100644
--- a/lib/risc/risc_value.rb
+++ b/lib/risc/risc_value.rb
@@ -4,9 +4,11 @@ module Risc
 
   class RiscValue
 
-    attr_accessor :symbol , :type , :value
+    attr_reader :symbol , :type , :value
 
-    def initialize r , type , value = nil
+    attr_accessor :builder
+
+    def initialize( r , type , value = nil)
       raise "wrong type for register init #{r}" unless r.is_a? Symbol
       raise "double r #{r}" if r.to_s[0,1] == "rr"
       raise "not reg #{r}" unless self.class.look_like_reg r
@@ -62,10 +64,14 @@ module Risc
       when RValue
         raise "not yet"
       when Parfait::Object
-        Risc.load_constant("#{load.class} to #{self.type}" , load , self)
+        ins = Risc.load_constant("#{load.class} to #{self.type}" , load , self)
+      when RiscValue
+        ins = Risc.transfer("#{load.type} to #{self.type}" , load , self)
       else
         raise "not implemented"
       end
+      builder.add_instruction(ins) if builder
+      return ins
     end
   end
 
diff --git a/test/risc/test_builder.rb b/test/risc/test_builder.rb
index 5e742b76..7333d0aa 100644
--- a/test/risc/test_builder.rb
+++ b/test/risc/test_builder.rb
@@ -2,5 +2,23 @@ require_relative "../helper"
 
 module Risc
   class TestBuilder < MiniTest::Test
+
+    def setup
+      Risc.machine.boot
+      init = Parfait.object_space.get_init
+      compiler = Risc::MethodCompiler.new( init )
+      @builder = Builder.new(compiler)
+    end
+    def test_has_build
+      assert_nil @builder.build{ }
+    end
+    def test_has_build_and_returns_built
+      r1 = RiscValue.new(:r1 , :Space)
+      built = @builder.build{ space << r1 }
+      assert_equal Transfer , built.class
+    end
+    def test_has_attribute
+      assert_nil @builder.built
+    end
   end
 end
diff --git a/test/risc/test_risc_value.rb b/test/risc/test_risc_value.rb
index a2a30610..77e628a9 100644
--- a/test/risc/test_risc_value.rb
+++ b/test/risc/test_risc_value.rb
@@ -1,6 +1,37 @@
 require_relative "../helper"
 
-module Risc
-  class TestRegisterValue < MiniTest::Test
+class FakeBuilder
+  attr_reader :built
+  def add_instruction(ins)
+    @built = ins
+  end
+end
+module Risc
+  class TestRegisterValue < MiniTest::Test
+
+    def setup
+      Risc.machine.boot
+      @r0 = RiscValue.new(:r0 , :Message)
+      @r1 = RiscValue.new(:r1 , :Space)
+    end
+
+    def test_r0
+      assert_equal :r0 , @r0.symbol
+    end
+
+    def test_load_space
+      move = @r0 << Parfait.object_space
+      assert_equal LoadConstant , move.class
+    end
+    def test_transfer
+      transfer = @r0 << @r1
+      assert_equal Transfer , transfer.class
+    end
+    def test_calls_builder
+      builder = FakeBuilder.new
+      @r0.builder = builder
+      @r0 << @r1
+      assert_equal Transfer , builder.built.class
+    end
   end
 end