Suppress warnings of `assigned but unused variable`

actionpack/test/dispatch/response_test.rb

@@ -146,7 +146,7 @@ def test_only_set_charset_still_defaults_to_text_html
 
   test "cookies" do
     @response.set_cookie("user_name", :value => "david", :path => "/")
-    status, headers, body = @response.to_a
+    _status, headers, _body = @response.to_a
     assert_equal "user_name=david; path=/", headers["Set-Cookie"]
     assert_equal({"user_name" => "david"}, @response.cookies)
   end
@@ -154,7 +154,7 @@ def test_only_set_charset_still_defaults_to_text_html
   test "multiple cookies" do
     @response.set_cookie("user_name", :value => "david", :path => "/")
     @response.set_cookie("login", :value => "foo&bar", :path => "/", :expires => Time.utc(2005, 10, 10,5))
-    status, headers, body = @response.to_a
+    _status, headers, _body = @response.to_a
     assert_equal "user_name=david; path=/\nlogin=foo%26bar; path=/; expires=Mon, 10 Oct 2005 05:00:00 -0000", headers["Set-Cookie"]
     assert_equal({"login" => "foo&bar", "user_name" => "david"}, @response.cookies)
   end
@@ -163,7 +163,6 @@ def test_only_set_charset_still_defaults_to_text_html
     @response.set_cookie("user_name", :value => "david", :path => "/")
     @response.set_cookie("login", :value => "foo&bar", :path => "/", :expires => Time.utc(2005, 10, 10,5))
     @response.delete_cookie("login")
-    status, headers, body = @response.to_a
     assert_equal({"user_name" => "david", "login" => nil}, @response.cookies)
   end