Adding comment for secondary constructor returns

Author: EnzeXing

compiler/src/dotty/tools/dotc/transform/init/Objects.scala

@@ -228,9 +228,6 @@ object Objects:
 
   val Bottom = RefSet(ListSet.empty)
 
-  // type ThisValue = Ref | Cold // used for typing thisV, whose value can only be Ref or Cold
-  // type VEOrCold = ValueElement | Cold
-
   /** Checking state  */
   object State:
     class Data:
@@ -726,7 +723,7 @@ object Objects:
           val tpl = cls.defTree.asInstanceOf[TypeDef].rhs.asInstanceOf[Template]
           extendTrace(cls.defTree) { eval(tpl, ref, cls, cacheResult = true) }
         else
-          extendTrace(ddef) {
+          extendTrace(ddef) { // The return values for secondary constructors can be ignored
             Returns.installHandler(ctor)
             eval(ddef.rhs, ref, cls, cacheResult = true)
             Returns.popHandler(ctor)