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[Bug 22808] Throw if object is constructed without new

From: <bugzilla@jessica.w3.org>
Date: Mon, 09 Feb 2015 17:04:25 +0000
To: public-script-coord@w3.org
Message-ID: <bug-22808-3890-VB7qJHVq0K@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=22808

--- Comment #12 from Erik Arvidsson <arv@google.com> ---
(In reply to Boris Zbarsky from comment #11)
> I just looked at ES6 again, and I'd like to see the edits Allen is making to
> the whole [[Call]]/[[Construct]]/@@create setup right now land before we
> change things in IDL here.  Because we're going to need to override
> [[Construct]] to not invoke [[Call]] and whatnot, but the exact interaction
> will depend on exactly what ES looks like.

In ES6, constructor functions created using the class syntax gets marked with
"classConstructor" and in the [[Call]] behavior,

http://people.mozilla.org/~jorendorff/es6-draft.html#sec-ecmascript-function-objects-call-thisargument-argumentslist

we have

2. If F’s [[FunctionKind]] internal slot is "classConstructor", throw a
TypeError exception.

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