3 files changed, 6 insertions, 5 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/Delambdafy.scala b/src/compiler/scala/tools/nsc/transform/Delambdafy.scala
index d2c511a2d1..1f832ba81e 100644
--- a/src/compiler/scala/tools/nsc/transform/Delambdafy.scala
+++ b/src/compiler/scala/tools/nsc/transform/Delambdafy.scala
@@ -113,7 +113,9 @@ abstract class Delambdafy extends Transform with TypingTransformers with ast.Tre
     // after working on the entire compilation until we'll have a set of
     // new class definitions to add to the top level
     override def transformStats(stats: List[Tree], exprOwner: Symbol): List[Tree] = {
-      super.transformStats(stats, exprOwner) ++ lambdaClassDefs(exprOwner)
+      // Need to remove from the lambdaClassDefs map: there may be multiple PackageDef for the same
+      // package when defining a package object. We only add the lambda class to one. See SI-9097.
+      super.transformStats(stats, exprOwner) ++ lambdaClassDefs.remove(exprOwner).getOrElse(Nil)
     }
 
     private def optionSymbol(sym: Symbol): Option[Symbol] = if (sym.exists) Some(sym) else None
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
diff --git a/src/compiler/scala/tools/nsc/transform/LambdaLift.scala b/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
index fa0c1f797b..a703542587 100644
--- a/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
+++ b/src/compiler/scala/tools/nsc/transform/LambdaLift.scala
@@ -539,12 +539,11 @@ abstract class LambdaLift extends InfoTransform {
     override def transformStats(stats: List[Tree], exprOwner: Symbol): List[Tree] = {
       def addLifted(stat: Tree): Tree = stat match {
         case ClassDef(_, _, _, _) =>
-          val lifted = liftedDefs get stat.symbol match {
+          val lifted = liftedDefs remove stat.symbol match {
             case Some(xs) => xs reverseMap addLifted
             case _        => log("unexpectedly no lifted defs for " + stat.symbol) ; Nil
           }
-          try deriveClassDef(stat)(impl => deriveTemplate(impl)(_ ::: lifted))
-          finally liftedDefs -= stat.symbol
+          deriveClassDef(stat)(impl => deriveTemplate(impl)(_ ::: lifted))
 
         case DefDef(_, _, _, _, _, Block(Nil, expr)) if !stat.symbol.isConstructor =>
           deriveDefDef(stat)(_ => expr)