how to chain exceptions in dart.

exception_chaning.dart

import 'dart:async';

void main() {
  runZoned(() {
    try {
      try {
        throw 'exception 1';
      } catch (e) {
        throw LinkedException('exception 2',e);
      }
    } catch (e) {
      throw LinkedException('exception 3',e);
    }
  }, onError: print);
}

class LinkedException implements Exception {
  final String cause;
  final exception;

  LinkedException(this.cause,[this.exception]);

  @override
  String toString() => '$cause <- $exception';
}