From e63e2f0da2ee1a224a0268e39ae81d4d98f0b1eb Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Tue, 1 Sep 2026 17:37:40 +0900
Subject: [PATCH] Add a regression test for re-analyzing an array pattern

`ArrayPatternNode` used to return `@posts`, an Array, from install, so the
invariant check in `update_rb_file` raised `RuntimeError: []` the second time a
file containing an array pattern was analyzed. f6a6e65c fixed it as a side
effect; nothing covered it.
---
 scenario/patterns/array_pat_reedit.rb | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 scenario/patterns/array_pat_reedit.rb

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