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Fix #19314 - fixing broken DoublyLinkedList after adding empty DoublyLinkedList (#19315) [backport]

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* Update lists.nim

* Update tlists.nim

(cherry picked from commit 526a32e169)
This commit is contained in:
rockcavera
2022-01-03 16:14:08 -03:00
committed by narimiran
parent 5f70b1ab53
commit 984691bb67
2 changed files with 18 additions and 6 deletions
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12
lib/pure/collections/lists.nim
View File

@@ -676,12 +676,12 @@ proc addMoved*[T](a, b: var DoublyLinkedList[T]) {.since: (1, 5, 1).} =
assert s == [0, 1, 0, 1, 0, 1]
if b.head != nil:
b.head.prev = a.tail
if a.tail != nil:
a.tail.next = b.head
a.tail = b.tail
if a.head == nil:
a.head = b.head
if a.head == nil:
a.head = b.head
else:
b.head.prev = a.tail
a.tail.next = b.head
a.tail = b.tail
if a.addr != b.addr:
b.head = nil
b.tail = nil

12
tests/stdlib/tlists.nim
View File

@@ -245,6 +245,18 @@ template main =
doAssert a.toSeq == @[1]
a.add(2)
doAssert a.toSeq == @[1, 2]
block issue19314: # add (appends a shallow copy)
var a: DoublyLinkedList[int]
var b: DoublyLinkedList[int]
doAssert a.toSeq == @[]
a.add(1)
doAssert a.toSeq == @[1]
a.add(b)
doAssert a.toSeq == @[1]
a.add(2)
doAssert a.toSeq == @[1, 2]
static: main()
main()