change return sequence to return messages to space

as it was before blocks
(thought blocks would make reuse of messages impossible, but was wrong, this only appilies to lambdas)
(too) many tests affected

test/mom/instruction/test_return_sequence.rb

@@ -10,32 +10,58 @@ module Risc
       @expect = "something"
       @produced = produce_instructions
     end
-    def main_ends
-      24
+    def instruction(num) # 24 is the main, see test/mom/send/test_setup_simple.rb
+      @produced.next( 24 + num)
     end
     def test_postamble_classes
       postamble.each_with_index do |ins , index|
-        assert_equal ins , @produced.next( main_ends + index).class
+        assert_equal ins , instruction( index).class , "wrong at #{index}"
       end
     end
     def test_main_label
-      assert_equal Label , @produced.next(main_ends).class
-      assert_equal "return_label" , @produced.next(main_ends).name
+      assert_equal Label , instruction(0).class
+      assert_equal "return_label" , instruction(0).name
     end
     def test_move_ret
-      assert_slot_to_reg( @produced.next(main_ends + 1) , :r0 ,  5 ,  :r1 )
+      assert_slot_to_reg( instruction( 1 ) , :r0 ,  5 ,  :r1 )
     end
     def test_move_caller
-      assert_slot_to_reg( @produced.next(main_ends + 2) , :r0 ,  6 ,  :r2 )
+      assert_slot_to_reg( instruction( 2 ) , :r0 ,  6 ,  :r2 )
     end
     def test_save_ret
-      assert_reg_to_slot( @produced.next(main_ends + 3) , :r1  ,  :r2 ,  5 )
+      assert_reg_to_slot( instruction( 3 ) , :r1  ,  :r2 ,  5 )
     end
+
+    def test_load_space
+      assert_load( instruction(4) , Parfait::Space )
+    end
+    def test_get_next
+      assert_slot_to_reg( instruction( 5 ) , :r3 ,  3 ,  :r4 )
+    end
+    def test_save_next
+      assert_reg_to_slot( instruction( 6 ) , :r4  ,  :r0 ,  1 )
+    end
+    def test_save_this
+      assert_reg_to_slot( instruction( 7 ) , :r0  ,  :r3 ,  3 )
+    end
+
     def test_save_addr
-      assert_slot_to_reg( @produced.next(main_ends + 4) , :r0 ,  4 ,  :r1 )
+      assert_slot_to_reg( instruction( 8 ) , :r0 ,  4 ,  :r1 )
     end
     def test_reduce_addr
-      assert_slot_to_reg( @produced.next(main_ends + 5) , :r1 ,  2 ,  :r1 )
+      assert_slot_to_reg( instruction( 9 ) , :r1 ,  2 ,  :r1 )
+    end
+    def test_reduce_caller
+      assert_slot_to_reg( instruction( 10 ) , :r0 ,  6 ,  :r0 )
+    end
+    def test_function_return
+      ret = instruction(11)
+      assert_equal FunctionReturn , ret.class
+      assert_equal :r1 , ret.register.symbol
+    end
+    def test_unreachable
+      assert_equal Label , instruction(12).class
+      assert_equal "unreachable" , instruction(12).name
     end
   end
 end