Refactor transformStats impls for consistency

Uses the same idiom in `Flatten` and `LambdaLift` as is established
in `Extender` and (recently) `Delambdafy`. This avoids any possibility
of adding a member to a package twice, as used to happen in SI-9097.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/transform/Flatten.scala b/src/compiler/scala/tools/nsc/transform/Flatten.scala
index 6149e40fa7..fbb0307773 100644
--- a/src/compiler/scala/tools/nsc/transform/Flatten.scala
+++ b/src/compiler/scala/tools/nsc/transform/Flatten.scala
@@ -166,7 +166,7 @@ abstract class Flatten extends InfoTransform {
     override def transformStats(stats: List[Tree], exprOwner: Symbol): List[Tree] = {
       val stats1 = super.transformStats(stats, exprOwner)
       if (currentOwner.isPackageClass) {
-        val lifted = liftedDefs(currentOwner).toList
+        val lifted = liftedDefs.remove(currentOwner).toList.flatten
         stats1 ::: lifted
       }
       else stats1