Fix #3207: Allow NamedArg parameters to be _* parameters

Author: odersky

compiler/src/dotty/tools/dotc/ast/TreeInfo.scala

@@ -173,6 +173,7 @@ trait TreeInfo[T >: Untyped <: Type] { self: Trees.Instance[T] =>
     case Typed(Ident(nme.WILDCARD_STAR), _) => true
     case Typed(_, Ident(tpnme.WILDCARD_STAR)) => true
     case Typed(_, tpt: TypeTree) => tpt.hasType && tpt.tpe.isRepeatedParam
+    case NamedArg(_, arg) => isWildcardStarArg(arg)
     case _ => false
   }
 

tests/pos/i3207.check

@@ -0,0 +1,2 @@
+WrappedArray()
+WrappedArray(A, B)

tests/pos/i3207.scala

@@ -0,0 +1,6 @@
+object Test extends App {
+  def foo(ff: String*) = ff
+  def bar(bb: String*) = foo(ff = bb: _*)
+  println(bar())
+  println(bar("A", "B"))
+}