rename set_slot

set_slot was clear about the target, but not the source.
Better with reg_to_slot (and soon it’s inverse slot_to_reg)

test/typed/parfait/test_named_list.rb

@@ -9,6 +9,8 @@ class TestNamedLists < MiniTest::Test
 
   def test_named_list_get_type
     assert_equal Parfait::Type , @type.class
+    assert @type.instance_names
+    assert @named_list.get_instance_variables
   end
 
   def test_named_list_next_set
@@ -16,4 +18,13 @@ class TestNamedLists < MiniTest::Test
     assert_equal :next_list , @named_list.next_list
   end
 
+  def test_new
+    list = Parfait::NamedList.new
+    assert list.get_type
+  end
+
+  def test_var_names
+    list = Parfait::NamedList.new
+    assert list.get_instance_variables
+  end
 end