All this time with Nil only claiming to be equa...

All this time with Nil only claiming to be equal to immutable.Seqs, how
is it possible? Closes #3923, no review.

2 files changed, 9 insertions, 1 deletions

diff --git a/src/library/scala/collection/immutable/List.scala b/src/library/scala/collection/immutable/List.scala
index 93c3134fd7..8c018912c2 100644
--- a/src/library/scala/collection/immutable/List.scala
+++ b/src/library/scala/collection/immutable/List.scala
@@ -391,7 +391,7 @@ case object Nil extends List[Nothing] {
     throw new UnsupportedOperationException("tail of empty list")
   // Removal of equals method here might lead to an infinite recursion similar to IntMap.equals.
   override def equals(that: Any) = that match {
-    case that1: Seq[_] => that1.isEmpty
+    case that1: collection.Seq[_] => that1.isEmpty
     case _ => false
   }
 }
diff --git a/test/files/run/bug3923.scala b/test/files/run/bug3923.scala
new file mode 100644
index 0000000000..484095a607
--- /dev/null
+++ b/test/files/run/bug3923.scala
@@ -0,0 +1,8 @@
+object Test {
+  def main(args: Array[String]): Unit = {
+    assert(collection.mutable.ArraySeq() == Nil)
+    assert(collection.mutable.ArraySeq() == Seq())
+    assert(Seq() == collection.mutable.ArraySeq())
+    assert(Nil == collection.mutable.ArraySeq())
+  }
+}