Fixes problematic equality of En umeration values.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/library/scala/Predef.scala b/src/library/scala/Predef.scala
index 20d70edadf..01df1a49f2 100644
--- a/src/library/scala/Predef.scala
+++ b/src/library/scala/Predef.scala
@@ -55,6 +55,22 @@ object Predef extends LowPriorityImplicits {
 
   @inline def locally[T](x: T): T = x
 
+  // hashcode -----------------------------------------------------------
+
+  @inline def hash(x: Any): Int =
+    if (x.isInstanceOf[Number]) runtime.BoxesRunTime.hashFromNumber(x.asInstanceOf[Number])
+    else x.hashCode
+
+  @inline def hash(x: Number): Int =
+    runtime.BoxesRunTime.hashFromNumber(x)
+
+  @inline def hash(x: java.lang.Long): Int = {
+    val iv = x.intValue
+    if (iv == x.longValue) iv else x.hashCode
+  }
+
+  @inline def hash(x: Int): Int = x
+
   // errors and asserts -------------------------------------------------
 
   def error(message: String): Nothing = throw new RuntimeException(message)