> Because the location info will be that of the "new Error"? One could
> try this instead, which seems to work for me:
>
> throw { __proto__ : new Error(), reason: "Monday" }

That one seems to be working (except in IE<11 since IE didn't support __proto__ prior to that). That somehow surprises me that browser "unwrap" the prototype chain but they seem to do in this case.

> Because the location info will be that of the `new Error`? One could
> try this instead, which seems to work for me:
>
> ```js
> throw { __proto__ : new Error(), reason: "Monday" }
> ```

That one seems to be working (except in IE<11 since IE didn't support `__proto__` prior to that). That somehow surprises me that browser "unwrap" the prototype chain but they seem to do in this case.