function RuntimeError(transactions, vmOutput) {
  // Why not just Error.apply(this, [message])? See
  // https://gist.github.com/justmoon/15511f92e5216fa2624b#anti-patterns
  Error.captureStackTrace(this, this.constructor);
  this.name = this.constructor.name;

  this.results = {};
  this.hashes = [];

  // handles creating this.message
  this.combine(transactions, vmOutput);
}