Overhauled sequence length logic in the pattern...

Overhauled sequence length logic in the pattern matcher. Removes
unnecessary boxing and a few varieties of wrongness.

Closes #3395, #3150, #2958, #2945, #2187. No review.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/files/pos/bug2187-2.scala b/test/files/pos/bug2187-2.scala
new file mode 100644
index 0000000000..3f2742dd89
--- /dev/null
+++ b/test/files/pos/bug2187-2.scala
@@ -0,0 +1,7 @@
+class Test {
+  def test[A](list: List[A]) = list match {
+    case Seq(x, y) => "xy"
+    case Seq(x) => "x"
+    case _ => "something else"
+  }
+}
\ No newline at end of file