1 files changed, 16 insertions, 0 deletions
diff --git a/test/ruby/test_jit.rb b/test/ruby/test_jit.rb
index 08093a5817..c1f2f7a6d5 100644
--- a/test/ruby/test_jit.rb
+++ b/test/ruby/test_jit.rb
@@ -793,6 +793,22 @@ class TestJIT < Test::Unit::TestCase
     end;
   end
 
+  def test_inlined_c_method
+    assert_eval_with_jit("#{<<~"begin;"}\n#{<<~"end;"}", stdout: "aaa", success_count: 2, recompile_count: 1, min_calls: 2)
+    begin;
+      def test(obj, recursive: nil)
+        if recursive
+          test(recursive)
+        end
+        obj.to_s
+      end
+
+      print(test('a')) # set #to_s cc to String#to_s (expecting C method)
+      print(test('a')) # JIT with #to_s cc: String#to_s
+      print(test('a', recursive: :foo)) # update #to_s cd->cc to Symbol#to_s, then go through inlined #to_s cc with Symbol#to_s
+    end;
+  end
+
   def test_inlined_exivar
     assert_eval_with_jit("#{<<~"begin;"}\n#{<<~"end;"}", stdout: "aaa", success_count: 3, recompile_count: 1, min_calls: 2)
     begin;