Fix first Slot instruction that uses builder

now without method_missing and names
but still with instance_eval, hmm. Tried without, makes code much less readable

test/slot_machine/instruction/test_truth_check.rb

@@ -7,18 +7,19 @@ module SlotMachine
       TruthCheck.new(target , Label.new("ok" , "target"))
     end
     def test_len
-      assert_equal 8 , all.length , all_str
+      assert_equal 8 , all.length
+      assert_equal Risc::Label , all.first.class
     end
     def test_1_slot
-      assert_slot_to_reg risc(1) ,:r0 , 6 , :r2
+      assert_slot_to_reg risc(1) ,:message , 6 , :"message.caller"
     end
     def test_2_load
-      assert_load risc(2) , Parfait::FalseClass , :r3
+      assert_load risc(2) , Parfait::FalseClass
     end
     def test_3_op
       assert_equal Risc::OperatorInstruction , risc(3).class
-      assert_equal :r3 , risc(3).left.symbol
-      assert_equal :r2 , risc(3).right.symbol
+      assert risc(3).left.is_object?
+      assert_equal :"message.caller" , risc(3).right.symbol
       assert_equal :- , risc(3).operator
     end
     def test_4_zero
@@ -26,12 +27,12 @@ module SlotMachine
       assert_label risc(4).label , "target"
     end
     def test_5_load
-      assert_load risc(5) , Parfait::NilClass , :r3
+      assert_load risc(5) , Parfait::NilClass
     end
     def test_6_op
       assert_equal Risc::OperatorInstruction , risc(6).class
-      assert_equal :r3 , risc(6).left.symbol
-      assert_equal :r2 , risc(6).right.symbol
+      assert risc(6).left.is_object?
+      assert_equal :"message.caller" , risc(6).right.symbol
       assert_equal :- , risc(6).operator
     end
     def test_7_zero