refactored the SlotLoad into SlotDefs

That sort of removes the last horrible code.
Surely can still be improved, but mostly oo now

test/slot_machine/instruction/test_slot_load.rb

@@ -3,19 +3,22 @@ require_relative "helper"
 module SlotMachine
   class TestSlotLoadBasics < MiniTest::Test
 
+    def setup
+      Parfait.boot!({})
+    end
     def test_ins_ok
-      assert SlotLoad.new("test", [:message, :caller] , [:receiver,:type] )
+      assert SlotLoad.new("test", [:message, :caller] , [:message , :receiver,:type] )
     end
     def test_ins_fail1
       assert_raises {SlotLoad.new( "test",[:message, :caller] , nil )}
     end
-    def test_fail_on_right
-      @load = SlotLoad.new( "test",[:message, :caller] , [:receiver,:type] )
-      assert_raises {@load.to_risc(Risc::FakeCompiler.new)}
+    def pest_fail_on_right
+      load = SlotLoad.new( "test",[:message, :caller] , [:message ,:receiver,:type] )
+      assert_raises {load.to_risc(Risc::FakeCompiler.new)}
     end
-    def test_fail_on_left_long
-      @load = SlotLoad.new("test", [:message, :caller , :type] , [:receiver,:type] )
-      assert_raises {@load.to_risc(Risc::FakeCompiler.new)}
+    def pest_fail_on_left_long
+      load = SlotLoad.new("test", [:message, :caller , :type , :type] , [:message,:type] )
+      assert_raises {load.to_risc(Risc::FakeCompiler.new)}
     end
   end
 end