FieldRef constructor
- String? name,
 - ObjRef? owner,
 - InstanceRef? declaredType,
 - bool? isConst,
 - bool? isFinal,
 - bool? isStatic,
 - required String id,
 - SourceLocation? location,
 
Implementation
FieldRef({
  this.name,
  this.owner,
  this.declaredType,
  this.isConst,
  this.isFinal,
  this.isStatic,
  required String id,
  this.location,
}) : super(
        id: id,
      );