Fix remove on last node of singly-linked list [backport:1.6] (#19353)

(cherry picked from commit 955040f0f1)
2026-08-30 18:41:45 +00:00 · 2022-01-10 09:27:59 +00:00
parent 2539d7a862
commit a90cabbe40
3 changed files with 19 additions and 0 deletions
--- a/lib/pure/collections/lists.nim
+++ b/lib/pure/collections/lists.nim
@@ -740,6 +740,8 @@ proc remove*[T](L: var SinglyLinkedList[T], n: SinglyLinkedNode[T]): bool {.disc
    if prev.next == nil:
      return false
    prev.next = n.next
+    if L.tail == n:
+      L.tail = prev # update tail if we removed the last node
  true

 proc remove*[T](L: var DoublyLinkedList[T], n: DoublyLinkedNode[T]) =