anchor.diff:  
     ResolutionImpact buildField(ir.Field field) {
       checkType(field.type, TypeUseKind.PARAMETER_CHECK);
  -    registerSeenClasses(field.type);
       if (field.initializer != null) {
         visitNode(field.initializer);
         if (!field.isInstanceMember &&
  
positive.code:   void visitStaticSet(ir.StaticSet node) {
      visitNode(node.value);
      MemberEntity member = elementMap.getMember(node.target);
      registerSeenClasses(node.target.setterType);
      impactBuilder.registerStaticUse(new StaticUse.staticSet(member));
    }
  
  
negative.code: 
      InterfaceType type = elementMap.createInterfaceType(
          target.enclosingClass, node.arguments.types);
      CallStructure callStructure = elementMap.getCallStructure(node.arguments);
      impactBuilder.registerStaticUse(isConst
          ? new StaticUse.constConstructorInvoke(constructor, callStructure, type)
  