Small cleanups and additions.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/dotty/tools/dotc/core/Substituters.scala b/src/dotty/tools/dotc/core/Substituters.scala
index 1b96de47e..3d14317cb 100644
--- a/src/dotty/tools/dotc/core/Substituters.scala
+++ b/src/dotty/tools/dotc/core/Substituters.scala
@@ -205,7 +205,11 @@ trait Substituters { this: Context =>
   final class SubstMap(from: List[Symbol], to: List[Type]) extends DeepTypeMap {
     def apply(tp: Type): Type = subst(tp, from, to, this)
   }
-
+/* not needed yet
+  final class SubstDealiasMap(from: List[Symbol], to: List[Type]) extends SubstMap(from, to) {
+    override def apply(tp: Type): Type = subst(tp.dealias, from, to, this)
+  }
+*/
   final class SubstSymMap(from: List[Symbol], to: List[Symbol]) extends DeepTypeMap {
     def apply(tp: Type): Type = substSym(tp, from, to, this)
   }