diff --git a/scenario/patterns/array_pat_reedit.rb b/scenario/patterns/array_pat_reedit.rb
new file mode 100644
index 00000000..5669301d
--- /dev/null
+++ b/scenario/patterns/array_pat_reedit.rb
@@ -0,0 +1,27 @@
+## update
+def foo(ary)
+  case ary
+  in [a]
+    a
+  end
+end
+foo([1])
+
+## assert
+class Object
+  def foo: ([Integer]) -> Integer
+end
+
+## update
+def foo(ary)
+  case ary
+  in [a]
+    a.to_s
+  end
+end
+foo([1])
+
+## assert
+class Object
+  def foo: ([Integer]) -> String
+end