More performance work.

Custom versions of collections which methods which operate on 2 or 3
collections.  Eliminated most users of zip/zipped.  Cleaned up the kinds
checking code somewhat.  Reduced the number of silent typechecks
being performed at named argument sites.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/library/scala/collection/LinearSeqLike.scala b/src/library/scala/collection/LinearSeqLike.scala
index 75c1edac66..ceb980ff80 100644
--- a/src/library/scala/collection/LinearSeqLike.scala
+++ b/src/library/scala/collection/LinearSeqLike.scala
@@ -13,6 +13,7 @@ import generic._
 import mutable.ListBuffer
 import immutable.List
 import scala.util.control.Breaks._
+import annotation.tailrec
 
 /** A template trait for linear sequences of type `LinearSeq[A]`.
  *
@@ -69,4 +70,9 @@ trait LinearSeqLike[+A, +Repr <: LinearSeqLike[A, Repr]] extends SeqLike[A, Repr
       xs
     }
   }
+
+  @tailrec override final def corresponds[B](that: GenSeq[B])(p: (A,B) => Boolean): Boolean = {
+    if (this.isEmpty) that.isEmpty
+    else that.nonEmpty && p(head, that.head) && (tail corresponds that.tail)(p)
+  }
 }