1 files changed, 27 insertions, 0 deletions
diff --git a/test/files/run/t4027.scala b/test/files/run/t4027.scala
new file mode 100644
index 0000000000..d70ca0cc3a
--- /dev/null
+++ b/test/files/run/t4027.scala
@@ -0,0 +1,27 @@
+
+
+import collection._
+
+
+/** Sorted maps should have `filterKeys` and `mapValues` which return sorted maps.
+ *  Mapping, filtering, etc. on these views should return sorted maps again.
+ */
+object Test extends App {
+  
+  val sortedmap = SortedMap(1 -> false, 2 -> true, 3 -> false, 4 -> true)
+  println(sortedmap.filterKeys(_ % 2 == 0): SortedMap[Int, Boolean])
+  println(sortedmap.mapValues(_ + "!"): SortedMap[Int, String])
+  println(sortedmap.filterKeys(_ % 2 == 0).map(t => (t._1, t._2.toString.length)): SortedMap[Int, Int])
+  println(sortedmap.mapValues(_ + "!").map(t => (t._1, t._2.toString.length)): SortedMap[Int, Int])
+  println(sortedmap.filterKeys(_ % 2 == 0).filter(t => t._1 < 2): SortedMap[Int, Boolean])
+  println(sortedmap.mapValues(_ + "!").filter(t => t._1 < 2): SortedMap[Int, String])
+  
+  val immsortedmap = immutable.SortedMap(1 -> false, 2 -> true, 3 -> false, 4 -> true)
+  println(immsortedmap.filterKeys(_ % 2 == 0): immutable.SortedMap[Int, Boolean])
+  println(immsortedmap.mapValues(_ + "!"): immutable.SortedMap[Int, String])
+  println(immsortedmap.filterKeys(_ % 2 == 0).map(t => (t._1, t._2.toString.length)): immutable.SortedMap[Int, Int])
+  println(immsortedmap.mapValues(_ + "!").map(t => (t._1, t._2.toString.length)): immutable.SortedMap[Int, Int])
+  println(immsortedmap.filterKeys(_ % 2 == 0).filter(t => t._1 < 2): immutable.SortedMap[Int, Boolean])
+  println(immsortedmap.mapValues(_ + "!").filter(t => t._1 < 2): immutable.SortedMap[Int, String])
+  
+}