Added ## method to Any as our scala hashCode me...

Added ## method to Any as our scala hashCode method which provides
consistent answers for primitive types. And I'm sure we're all tired of
new starrs, but it's hard to add a method to Any without one. This patch
only brings ## into existence, but nothing calls it yet.

// some true assertions
scala> assert(5.5f.## == 5.5f.hashCode)
scala> assert(5.0f.## != 5.0f.hashCode && 5.0f.## == 5L.##)

No review.  (Already reviewed by odersky.)

1 files changed, 15 insertions, 0 deletions

diff --git a/test/files/run/hashhash.scala b/test/files/run/hashhash.scala
new file mode 100644
index 0000000000..4a34ab12e0
--- /dev/null
+++ b/test/files/run/hashhash.scala
@@ -0,0 +1,15 @@
+object Test
+{
+  class A { val x1 = this.## ; val x2 = super.## }
+  val myA = new A
+  assert(myA.x1 == myA.x2)
+
+  def confirmSame(x: Any)       = assert(x.## == x.hashCode, "%s.## != %s.hashCode".format(x, x))
+  def confirmDifferent(x: Any)  = assert(x.## != x.hashCode, "%s.## == %s.hashCode (but should not)".format(x, x))
+
+  def main(args: Array[String]): Unit = {
+    /** Just a little sanity check, not to be confused with a unit test. */
+    List(5, 5.5f, "abc", new AnyRef, new A, ()) foreach confirmSame
+    List(5.0f, 1.0d, -(5.0f), (-1.0d)) foreach confirmDifferent
+  }
+}