Lots of work hardening matching on sequences.

one long-standing bug which actually had a test case testing its
bugginess (which is to say, when I fixed the bug, the test case failed.)
This:

-    def doMatch4(xs:Seq[Char]) = xs match {
-      case Seq(x, y, _*) => x::y::Nil
-      case Seq(x, y, z, w) => List(z,w) // redundant!
-    }

...should never have compiled - which must have been recognized
on some level given the "redundant!" comment, but it never made
it into neg/.

1 files changed, 1 insertions, 4 deletions

diff --git a/test/files/neg/patternalts.scala b/test/files/neg/patternalts.scala
index 62d0325a8b..513b81eb5e 100644
--- a/test/files/neg/patternalts.scala
+++ b/test/files/neg/patternalts.scala
@@ -2,7 +2,4 @@ object Test {
   List(1) match {
     case List(x) | List() => Console.println(x)
   }
-  List(2) match {
-    case List(_: Int) | List() => Console.println()
-  }
-}
+}
\ No newline at end of file