Implement `bind_call` method from Ruby2.7.

mrbgems/mruby-method/mrblib/method.rb

@@ -6,18 +6,6 @@ class Method
     }
   end
 
-  def owner
-    @owner
-  end
-
-  def receiver
-    @recv
-  end
-
-  def name
-    @name
-  end
-
   def <<(other)
     ->(*args, &block) { call(other.call(*args, &block)) }
   end

mrbgems/mruby-method/mrblib/unbound_method.rb

-class UnboundMethod
-  def owner
-    @owner
-  end
-
-  def name
-    @name
-  end
-end

mrbgems/mruby-method/test/method.rb

@@ -441,3 +441,11 @@ assert 'UnboundMethod#bind' do
   assert_raise(TypeError) { Array.instance_method(:each).bind(1) }
   assert_kind_of Method, Object.instance_method(:object_id).bind(Object.new)
 end
+
+assert 'UnboundMethod#bind_call' do
+  m = Array.instance_method(:size)
+  assert_equal(:size, m.name)
+  assert_equal(0, m.bind_call([]))
+  assert_equal(1, m.bind_call([1]))
+  assert_equal(2, m.bind_call([1,2]))
+end