fixes #25173; SinglyLinkedList.remove broken / AssertionDefect (#25175)

fixes #25173 (cherry picked from commit 51a9ada043)
2026-04-19 14:00:35 +00:00 · 2025-09-16 23:05:09 +08:00
parent 8ea9c6454c
commit cf5099cdba
2 changed files with 14 additions and 0 deletions
--- a/lib/pure/collections/lists.nim
+++ b/lib/pure/collections/lists.nim
@@ -708,6 +708,8 @@ proc remove*[T](L: var SinglyLinkedList[T], n: SinglyLinkedNode[T]): bool {.disc
    L.head = n.next
    if L.tail.next == n:
      L.tail.next = L.head # restore cycle
+    if L.tail == n:
+      L.tail = nil # reset tail if we removed the last node
  else:
    var prev {.cursor.} = L.head
    while prev.next != n and prev.next != nil: