On 8/9/2013 4:03 PM, Allen Wirfs-Brock wrote:
const MUST = () => {throw TypeError("Missing required parameter"};function foo (a=MUST(), b, c) {...}
But that doesn't work for:
```js
function foo({ a } = { a: MUST() }){}
foo({}); // doesn't throw
function bar({ +a }){}
bar({}); // would throw
```
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