| 'use strict'; | 
| var defineBuiltIn = require('../internals/define-built-in'); | 
| var errorToString = require('../internals/error-to-string'); | 
|   | 
| var ErrorPrototype = Error.prototype; | 
|   | 
| // `Error.prototype.toString` method fix | 
| // https://tc39.es/ecma262/#sec-error.prototype.tostring | 
| if (ErrorPrototype.toString !== errorToString) { | 
|   defineBuiltIn(ErrorPrototype, 'toString', errorToString); | 
| } |