'use strict' var inherits = require('inherits') module.exports = SaveStack function SaveStack (fn) { Error.call(this) Error.captureStackTrace(this, fn || SaveStack) } inherits(SaveStack, Error) SaveStack.prototype.completeWith = function (er) { this['__' + 'proto' + '__'] = er this.stack = this.stack + '\n\n' + er.stack return this }