Skip to content

Commit

Permalink
Fix nim-lang#19314 - fixing broken DoublyLinkedList after adding em…
Browse files Browse the repository at this point in the history
…pty `DoublyLinkedList` (nim-lang#19315) [backport]

* Update lists.nim

* Update tlists.nim
  • Loading branch information
rockcavera authored and PMunch committed Mar 28, 2022
1 parent b5d7c82 commit 37e26f9
Show file tree
Hide file tree
Showing 2 changed files with 18 additions and 6 deletions.
12 changes: 6 additions & 6 deletions lib/pure/collections/lists.nim
Original file line number Diff line number Diff line change
Expand Up @@ -675,12 +675,12 @@ 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
Expand Down
12 changes: 12 additions & 0 deletions tests/stdlib/tlists.nim
Original file line number Diff line number Diff line change
Expand Up @@ -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()

0 comments on commit 37e26f9

Please sign in to comment.