Change treeTransformPhase for SyntheticMethods to new default

Author: odersky

src/dotty/tools/dotc/transform/SyntheticMethods.scala

@@ -35,6 +35,7 @@ class SyntheticMethods extends MiniPhaseTransform with IdentityDenotTransformer
   import ast.tpd._
 
   override def phaseName = "synthetics"
+  override def treeTransformPhase = thisTransformer.next
 
   private var valueSymbols: List[Symbol] = _
   private var caseSymbols: List[Symbol] = _
@@ -170,7 +171,7 @@ class SyntheticMethods extends MiniPhaseTransform with IdentityDenotTransformer
   override def transformTemplate(impl: Template)(implicit ctx: Context, info: TransformerInfo) =
     if (ctx.owner.is(Case) || isDerivedValueClass(ctx.owner))
       cpy.Template(impl)(
-        body = impl.body ++ syntheticMethods(ctx.owner.asClass)(ctx.withPhase(thisTransformer.next)))
+        body = impl.body ++ syntheticMethods(ctx.owner.asClass))
     else
       impl
 }