did return sequence

surprisingly easy. also some check polish

lib/slot_machine/instructions/check.rb

@@ -19,7 +19,8 @@ module SlotMachine
 
     def set_label(false_label)
       @false_label = false_label
-      raise "Jump target must be a label #{false_label}" unless false_label.is_a?(Label)    end
+      raise "Jump target must be a label #{false_label}" unless false_label.is_a?(Label)
+    end
   end
 
 end

lib/slot_machine/instructions/return_sequence.rb

@@ -20,16 +20,9 @@ module SlotMachine
   #
   class ReturnSequence < Instruction
     def to_risc(compiler)
-      compiler.reset_regs
-      builder = compiler.builder(self)
-      builder.build do
-        object! << message[:return_value]
-        caller_reg! << message[:caller]
-        caller_reg[:return_value] << object
-      end
-      builder.build do
-        return_address! << message[:return_address]
-        return_address << return_address[ Parfait::Integer.integer_index]
+      compiler.build(to_s) do
+        message[:caller][:return_value] << message[:return_value]
+        return_address = message[:return_address].to_reg
         message << message[:caller]
         add_code Risc.function_return("return #{compiler.callable.name}", return_address)
       end

lib/slot_machine/instructions/truth_check.rb

@@ -21,7 +21,7 @@ module SlotMachine
     def to_risc(compiler)
       false_label = @false_label.risc_label(compiler)
       condition_reg = @condition.to_register(compiler,self)
-      
+
       compiler.build(self.to_s) do
         object = load_object Parfait.object_space.false_object
         object.op :- , condition_reg