Unexpected token with node magic syntax

[edpop]

Reproducing

1. Files

   
   // test/test.js
   const assert = require('assert');

let {a:b = null} = {a: 'hello'};

console.log('Here is OK'); assert(b === 'hello');

require('../modules/module');

```js
// modules/module.js
console.log('Here is FAIL');
let {a:b = null} = {a: 'hello'};

2. npm scripts

   {
   "coverage": "istanbul cover _mocha -- -R spec",
   "test": "mocha"
   }

npm test works fine, but npm run coverage fails with

SyntaxError: Unexpected token :
    at Object.exports.runInThisContext (vm.js:76:16)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions.(anonymous function) [as .js] (/home/%USERNAME%/mocha_test/node_modules/istanbul/lib/hook.js:107:24)
......

If I comment let {a:b = null} = {a: 'hello'}; in module.js, then it will be OK.

I hate this syntax, but it works in real life outside of istanbul.

ENV

node: 6.9.1 npm: 3.10.8 istanbul: 0.4.5 mocha: 3.4.2

[edpop]

Fixed in nyc