1 files changed, 18 insertions, 0 deletions
diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 8d6274adf3..28617b60b4 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -2256,4 +2256,22 @@ EOS
       system(bin, "--disable=gems", "-w", "-e", "puts ARGV", *args)
     end;
   end
+
+  def test_to_hash_on_arguments
+    all_assertions do |a|
+      %w[Array String].each do |type|
+        a.for(type) do
+          assert_separately(['-', EnvUtil.rubybin], <<~"END;")
+          class #{type}
+            def to_hash
+              raise "[Bug-12355]: #{type}#to_hash is called"
+            end
+          end
+          ex = ARGV[0]
+          assert_equal(true, system([ex, ex], "-e", ""))
+          END;
+        end
+      end
+    end
+  end
 end