Added +: and :+ extractors to mirror append/prepend.

* +: does head/tail decomposition on any Seq
* :+ does init/last decomposition on any Seq
* Both preserve specific Seq types.

Review by @odersky

1 files changed, 8 insertions, 0 deletions

diff --git a/test/files/run/matchonseq.scala b/test/files/run/matchonseq.scala
new file mode 100644
index 0000000000..49b406a6ec
--- /dev/null
+++ b/test/files/run/matchonseq.scala
@@ -0,0 +1,8 @@
+object Test extends App{
+  Vector(1,2,3) match { 
+   case head +: tail => println("It worked! head=" + head) 
+  }
+  Vector(1,2,3) match { 
+   case init :+ last => println("It worked! last=" + last) 
+  }
+}