Integrate `Fixnum` class into `Integer` class

* The `Fixnum` constant is now an alias for the `Integer` class.
* Remove `struct mrb_state::fixnum_class` member.
  If necessary, use `struct mrb_state::integer_class` instead.

1 files changed, 4 insertions, 4 deletions

diff --git a/mrbgems/mruby-method/test/method.rb b/mrbgems/mruby-method/test/method.rb
index 641979d71..123ae34be 100644
--- a/mrbgems/mruby-method/test/method.rb
+++ b/mrbgems/mruby-method/test/method.rb
@@ -77,7 +77,7 @@ end
 
 assert 'instance' do
   assert_kind_of Method, 1.method(:+)
-  assert_kind_of UnboundMethod, Fixnum.instance_method(:+)
+  assert_kind_of UnboundMethod, Integer.instance_method(:+)
 end
 
 assert 'Method#call' do
@@ -404,9 +404,9 @@ assert 'UnboundMethod#arity' do
 end
 
 assert 'UnboundMethod#==' do
-  assert_false(Fixnum.instance_method(:+) == Fixnum.instance_method(:-))
-  assert_true(Fixnum.instance_method(:+) == Fixnum.instance_method(:+))
-  assert_false(Fixnum.instance_method(:+) == Float.instance_method(:+))
+  assert_false(Integer.instance_method(:+) == Integer.instance_method(:-))
+  assert_true(Integer.instance_method(:+) == Integer.instance_method(:+))
+  assert_false(Integer.instance_method(:+) == Float.instance_method(:+))
   assert_true(UnboundMethod.instance_method(:==) == UnboundMethod.instance_method(:eql?))
 end