1 files changed, 2 insertions, 2 deletions
diff --git a/src/dotty/tools/dotc/typer/Inferencing.scala b/src/dotty/tools/dotc/typer/Inferencing.scala
index 599dc5f4e..070a149d4 100644
--- a/src/dotty/tools/dotc/typer/Inferencing.scala
+++ b/src/dotty/tools/dotc/typer/Inferencing.scala
@@ -97,8 +97,8 @@ object Inferencing {
   case class ViewProto(argType: Type, override val resultType: Type)(implicit ctx: Context) extends CachedGroundType with ProtoType {
     def isMatchedBy(tp: Type)(implicit ctx: Context) =
       ctx.typer.isApplicableToTypes(tp, argType :: Nil, resultType)
-    override def namedPartsWith(p: NamedType => Boolean)(implicit ctx: Context): Set[NamedType] =
-      argType.namedPartsWith(p) | resultType.namedPartsWith(p)
+    override def namedPartsWith(p: NamedType => Boolean)(implicit ctx: Context): collection.Set[NamedType] =
+      AndType(argType, resultType).namedPartsWith(p) // this is more efficient than oring two namedParts sets
     override def computeHash = doHash(argType, resultType)
   }