container/list: remove temporary variable `n`

The variable `n` for saving the pointer of the next
element when insert new element into the list turns
out to be unnecessary.

Change-Id: I17b85fd8350738815c320a83945525b60c2f04c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/207037
Reviewed-by: Robert Griesemer <gri@golang.org>

diff --git a/src/container/list/list.go b/src/container/list/list.go
index b8b599aabb11d297cf7f61e31ddf11ab3dadb9dd..cc9ff0988cd863f68f03688bb6521d6c1945242f 100644 (file)
--- a/src/container/list/list.go
+++ b/src/container/list/list.go
@@ -90,11 +90,10 @@ func (l *List) lazyInit() {
 
 // insert inserts e after at, increments l.len, and returns e.
 func (l *List) insert(e, at *Element) *Element {
-       n := at.next
-       at.next = e
        e.prev = at
-       e.next = n
-       n.prev = e
+       e.next = at.next
+       e.prev.next = e
+       e.next.prev = e
        e.list = l
        l.len++
        return e
@@ -124,11 +123,10 @@ func (l *List) move(e, at *Element) *Element {
        e.prev.next = e.next
        e.next.prev = e.prev
 
-       n := at.next
-       at.next = e
        e.prev = at
-       e.next = n
-       n.prev = e
+       e.next = at.next
+       e.prev.next = e
+       e.next.prev = e
 
        return e
 }