[Bug 22808] Throw if object is constructed without new

https://www.w3.org/Bugs/Public/show_bug.cgi?id=22808

--- Comment #16 from Boris Zbarsky <bzbarsky@mit.edu> ---
So I just looked through the ES6 spec.  The only other use of [[FunctionKind]]
is to prevent subclassing a generator function.  This use assumes that anything
without a [[FunctionKind]] slot is not a generator, so works fine with Web IDL.

What we _could_ consider is giving a [[FunctionKind]] slot to what the spec
calls "Built-in Function objects" and checking it in
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-built-in-function-objects-call-thisargument-argumentslist
(and modifying
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-built-in-function-objects-construct-argumentslist-newtarget
to not check it, I guess).  That's assuming we don't want the existence of a
[[FunctionKind]] slot to imply the function is an "ECMASCript Language
function".

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Received on Monday, 9 February 2015 17:50:03 UTC