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fix MutableLinkedList when appending empty list
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src/mutable_list.jl

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -152,9 +152,9 @@ end
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function Base.append!(l1::MutableLinkedList{T}, l2::MutableLinkedList{T}) where T
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l1.node.prev.next = l2.node.next # l1's last's next is now l2's first
155-
l2.node.prev.next = l1.node # l2's last's next is now l1.node
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l2.node.next.prev = l1.node.prev # l2's first's prev is now l1's last
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l1.node.prev = l2.node.prev # l1's first's prev is now l2's last
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l1.node.prev = l2.node.prev # l1's last is now l2's last
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l2.node.prev.next = l1.node # l2's last's next is now l1.node
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l1.len += length(l2)
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# make l2 empty
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l2.node.prev = l2.node

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