diff options
| -rw-r--r-- | src/library/scala/collection/immutable/List.scala | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/src/library/scala/collection/immutable/List.scala b/src/library/scala/collection/immutable/List.scala index 8c018912c2..f717d516aa 100644 --- a/src/library/scala/collection/immutable/List.scala +++ b/src/library/scala/collection/immutable/List.scala @@ -99,8 +99,6 @@ sealed abstract class List[+A] extends LinearSeq[A] * Like `xs map f`, but returns `xs` unchanged if function * `f` maps all elements to themselves (wrt eq). * - * Note: Unlike `map`, `mapConserve` is not tail-recursive. - * * @param f the function to apply to each element. * @tparam B the element type of the returned collection. * @return a list resulting from applying the given function @@ -118,7 +116,7 @@ sealed abstract class List[+A] extends LinearSeq[A] val head0 = pending.head val head1 = f(head0) - if (head1 == head0) + if (head1 eq head0.asInstanceOf[AnyRef]) loop(mapped, unchanged, pending.tail) else { val b = if (mapped eq null) new ListBuffer[B] else mapped |