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fix MutableLinkedList when appending empty list #915

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fix MutableLinkedList when appending empty list #915

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4 changes: 2 additions & 2 deletions src/mutable_list.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -152,9 +152,9 @@ end

function Base.append!(l1::MutableLinkedList{T}, l2::MutableLinkedList{T}) where T
l1.node.prev.next = l2.node.next # l1's last's next is now l2's first
l2.node.prev.next = l1.node # l2's last's next is now l1.node
l2.node.next.prev = l1.node.prev # l2's first's prev is now l1's last
l1.node.prev = l2.node.prev # l1's first's prev is now l2's last
l1.node.prev = l2.node.prev # l1's last is now l2's last
l2.node.prev.next = l1.node # l2's last's next is now l1.node
l1.len += length(l2)
# make l2 empty
l2.node.prev = l2.node
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