From 4fe51dfdae84f139bb92f8517aff914c4adb052c Mon Sep 17 00:00:00 2001
From: glepnir <glephunter@gmail.com>
Date: Wed, 23 Jul 2025 08:40:24 +0800
Subject: fix(iter): ArrayIter:last returns nil when filtered to empty #34697

Problem: After filtering out all elements, ArrayIter:last still returns a stale element.
Solution: Add check for self._head == self._tail and return nil early.

Fix #34696
---
 runtime/lua/vim/iter.lua | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'runtime/lua')

diff --git a/runtime/lua/vim/iter.lua b/runtime/lua/vim/iter.lua
index c1dd20f745..f3062564ce 100644
--- a/runtime/lua/vim/iter.lua
+++ b/runtime/lua/vim/iter.lua
@@ -1010,6 +1010,9 @@ end
 
 ---@private
 function ArrayIter:last()
+  if self._head >= self._tail then
+    return nil
+  end
   local inc = self._head < self._tail and 1 or -1
   local v = self._table[self._tail - inc]
   self._head = self._tail
-- 
cgit