Retain non-atomic type trees

Author: nicolasstucki

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

@@ -50,8 +50,9 @@ class PCPCheckAndHeal(@constructorOnly ictx: Context) extends TreeMapWithStages(
 
       // Type trees
 
-      case _: TypTree =>
-        if needsHealing(tree.tpe) then TypeTree(healType(tree.sourcePos)(tree.tpe)).withSpan(tree.span)
+      case _: TypeTree =>
+        if needsHealing(tree.tpe) then
+          TypeTree(healType(tree.sourcePos)(tree.tpe)).withSpan(tree.span)
         else tree
       case _: RefTree if tree.isType =>
         if needsHealing(tree.tpe) then TypeTree(healType(tree.sourcePos)(tree.tpe)).withSpan(tree.span)