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, 42 insertions, 0 deletions

diff --git a/test/files/run/patmat-seqs.scala b/test/files/run/patmat-seqs.scala
new file mode 100644
index 0000000000..b5c47b4b4b
--- /dev/null
+++ b/test/files/run/patmat-seqs.scala
@@ -0,0 +1,42 @@
+object Test {
+  def f1(x: Any) = x match {
+    case Seq(1, 2, 3) => "s3"
+    case Seq(4, 5) => "s2"
+    case Seq(7) => "s1"
+    case Nil => "s0"
+    case Seq(_, _, _, _, _, x: String) => "ss6"
+    case _ => "d"
+  }
+
+  def f2(x: Any) = x match {
+    case Seq("a", "b", _*)  => "s2"
+    case Seq(1, _*)         => "s1"
+    case Seq(5, 6, 7, _*)   => "s3"
+    case _                  => "d"
+  }
+
+  def main(args: Array[String]): Unit = {
+    val xs1 = List(
+      List(1,2,3),
+      List(4,5),
+      Vector(7),
+      Seq(),
+      Seq(1, 2, 3, 4, 5, "abcd"),
+      "abc"
+    ) map f1
+
+    xs1 foreach println
+
+    val xs2 = List(
+      Seq(5, 6, 7),
+      Seq(5, 6, 7, 8, 9),
+      Seq("a"),
+      Seq(1, 6, 7),
+      List(5, 6, 7),
+      Nil,
+      5
+    ) map f2
+
+    xs2 foreach println
+  }
+}