1 files changed, 4 insertions, 0 deletions
diff --git a/test/ruby/test_struct.rb b/test/ruby/test_struct.rb
index 6ba28153e9..ec7728b197 100644
--- a/test/ruby/test_struct.rb
+++ b/test/ruby/test_struct.rb
@@ -112,6 +112,10 @@ module TestStruct
     assert_equal @Struct::KeywordInitTrue.new(a: 1, b: 2).values, @Struct::KeywordInitFalse.new(1, 2).values
     assert_equal "#{@Struct}::KeywordInitFalse", @Struct::KeywordInitFalse.inspect
     assert_equal "#{@Struct}::KeywordInitTrue(keyword_init: true)", @Struct::KeywordInitTrue.inspect
+    k = Class.new(@Struct::KeywordInitFalse) {def initialize(**) end}
+    assert_warn(/The last argument is used as the keyword parameter/) {k.new(a: 1, b: 2)}
+    k = Class.new(@Struct::KeywordInitTrue) {def initialize(**) end}
+    assert_warn('') {k.new(a: 1, b: 2)}
 
     @Struct.instance_eval do
       remove_const(:KeywordInitTrue)