fix ivar test by actually creating ivar first

nice to know one gets errors for using an ivar that was not assigned to

test/vool/to_mom/test_assign.rb

@@ -6,29 +6,29 @@ module Vool
 
     def setup
       Risc.machine.boot
-      @stats = compile_first_method( "local = 5")
+      @ins = compile_first_method( "local = 5")
     end
 
     def test_class_compiles
-      assert_equal Mom::SlotLoad , @stats.class , @stats
+      assert_equal Mom::SlotLoad , @ins.class , @ins
     end
     def test_slot_is_set
-      assert @stats.left
+      assert @ins.left
     end
     def test_slot_starts_at_message
-      assert_equal :message , @stats.left.known_object
+      assert_equal :message , @ins.left.known_object
     end
     def test_slot_gets_self
-      assert_equal :frame , @stats.left.slots[0]
+      assert_equal :frame , @ins.left.slots[0]
     end
     def test_slot_assigns_to_local
-      assert_equal :local , @stats.left.slots[-1]
+      assert_equal :local , @ins.left.slots[-1]
     end
     def test_slot_assigns_something
-      assert @stats.right
+      assert @ins.right
     end
     def test_slot_assigns_int
-      assert_equal Mom::IntegerConstant ,  @stats.right.known_object.class
+      assert_equal Mom::IntegerConstant ,  @ins.right.known_object.class
     end
   end
 
@@ -37,10 +37,10 @@ module Vool
     include MomCompile
     def setup
       Risc.machine.boot
-      @stats = compile_first_method( "local = @a")
+      @ins = compile_first_method( "@a = 5 ; local = @a")
     end
     def test_class_compiles
-      assert_equal Mom::SlotLoad , @stats.class , @stats
+      assert_equal Mom::SlotLoad , @ins.next.class , @ins
     end
   end
 
@@ -50,23 +50,23 @@ module Vool
 
     def setup
       Risc.machine.boot
-      @stats = compile_first_method( "arg = 5")
+      @ins = compile_first_method( "arg = 5")
     end
 
     def test_class_compiles
-      assert_equal Mom::SlotLoad , @stats.class , @stats
+      assert_equal Mom::SlotLoad , @ins.class , @ins
     end
     def test_slot_is_set
-      assert @stats.left
+      assert @ins.left
     end
     def test_slot_starts_at_message
-      assert_equal :message , @stats.left.known_object
+      assert_equal :message , @ins.left.known_object
     end
     def test_slot_gets_self
-      assert_equal :arguments , @stats.left.slots[0]
+      assert_equal :arguments , @ins.left.slots[0]
     end
     def test_slot_assigns_to_local
-      assert_equal :arg , @stats.left.slots[-1]
+      assert_equal :arg , @ins.left.slots[-1]
     end
   end
 
@@ -76,14 +76,14 @@ module Vool
       Risc.machine.boot
     end
     def test_assigns_const
-      @stats = compile_first_method( "@a = 5")
+      @ins = compile_first_method( "@a = 5")
-      assert_equal Mom::SlotLoad , @stats.class , @stats
+      assert_equal Mom::SlotLoad , @ins.class , @ins
-      assert_equal Mom::IntegerConstant , @stats.right.known_object.class , @stats
+      assert_equal Mom::IntegerConstant , @ins.right.known_object.class , @ins
     end
     def test_assigns_move
-      @stats = compile_first_method( "@a = arg")
+      @ins = compile_first_method( "@a = arg")
-      assert_equal Mom::SlotLoad , @stats.class , @stats
+      assert_equal Mom::SlotLoad , @ins.class , @ins
-      assert_equal Mom::SlotDefinition , @stats.right.class , @stats
+      assert_equal Mom::SlotDefinition , @ins.right.class , @ins
     end
   end