Merge pull request #5632 from dotty-staging/fix-#5411

Fix #5411: varargs with intersection type elements

Author: odersky

compiler/src/dotty/tools/dotc/transform/ElimRepeated.scala

@@ -13,6 +13,7 @@ import Constants._
 import Decorators._
 import Denotations._, SymDenotations._
 import dotty.tools.dotc.ast.tpd
+import TypeErasure.erasure
 import DenotTransformers._
 
 object ElimRepeated {
@@ -92,7 +93,7 @@ class ElimRepeated extends MiniPhase with InfoTransformer { thisPhase =>
       JavaSeqLiteral(elems, elemtpt)
     case _ =>
       val elemType = tree.tpe.elemType
-      var elemClass = elemType.classSymbol
+      var elemClass = erasure(elemType).classSymbol
       if (defn.NotRuntimeClasses.contains(elemClass)) elemClass = defn.ObjectClass
       ref(defn.DottyArraysModule)
         .select(nme.seqToArray)

tests/pos/i5411.scala

@@ -0,0 +1,5 @@
+trait A
+trait B
+object O {
+  def m(x: Seq[A & B]) = java.util.Arrays.asList(x: _*)
+}