Rename `iv_count` on shapes to `next_iv_index`

`iv_count` is a misleading name because when IVs are unset, the new
shape doesn't decrement this value. `next_iv_count` is an accurate, and
more descriptive name.

1 files changed, 4 insertions, 4 deletions

diff --git a/test/ruby/test_shapes.rb b/test/ruby/test_shapes.rb
index 0f947bcd47..23696acc70 100644
--- a/test/ruby/test_shapes.rb
+++ b/test/ruby/test_shapes.rb
@@ -65,25 +65,25 @@ class TestShapes < Test::Unit::TestCase
   def test_iv_index
     example = RemoveAndAdd.new
     shape = RubyVM::Shape.of(example)
-    assert_equal 0, shape.iv_count
+    assert_equal 0, shape.next_iv_index
 
     example.add_foo # makes a transition
     new_shape = RubyVM::Shape.of(example)
     assert_equal([:@foo], example.instance_variables)
     assert_equal(shape.id, new_shape.parent.id)
-    assert_equal(1, new_shape.iv_count)
+    assert_equal(1, new_shape.next_iv_index)
 
     example.remove # makes a transition
     remove_shape = RubyVM::Shape.of(example)
     assert_equal([], example.instance_variables)
     assert_equal(new_shape.id, remove_shape.parent.id)
-    assert_equal(1, remove_shape.iv_count)
+    assert_equal(1, remove_shape.next_iv_index)
 
     example.add_bar # makes a transition
     bar_shape = RubyVM::Shape.of(example)
     assert_equal([:@bar], example.instance_variables)
     assert_equal(remove_shape.id, bar_shape.parent.id)
-    assert_equal(2, bar_shape.iv_count)
+    assert_equal(2, bar_shape.next_iv_index)
   end
 
   def test_new_obj_has_root_shape