Optimization in InstantiateDependentMap

Avoid creating a throwaway array in existentialsNeeded.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/reflect/scala/reflect/internal/tpe/TypeMaps.scala b/src/reflect/scala/reflect/internal/tpe/TypeMaps.scala
index 09f4389b82..f427813c01 100644
--- a/src/reflect/scala/reflect/internal/tpe/TypeMaps.scala
+++ b/src/reflect/scala/reflect/internal/tpe/TypeMaps.scala
@@ -861,7 +861,7 @@ private[internal] trait TypeMaps {
   class InstantiateDependentMap(params: List[Symbol], actuals0: List[Type]) extends TypeMap with KeepOnlyTypeConstraints {
     private val actuals      = actuals0.toIndexedSeq
     private val existentials = new Array[Symbol](actuals.size)
-    def existentialsNeeded: List[Symbol] = existentials.filter(_ ne null).toList
+    def existentialsNeeded: List[Symbol] = existentials.iterator.filter(_ ne null).toList
 
     private object StableArg {
       def unapply(param: Symbol) = Arg unapply param map actuals filter (tp =>