[Webkit-unassigned] [Bug 31813] Add support for block scope const

Thu Nov 17 08:52:07 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=31813

--- Comment #10 from Andy Wingo <wingo at igalia.com>  2011-11-17 08:52:07 PST ---
Thanks for the notes, Gavin.

(In reply to comment #5)
> I guess there are really three options here - always allow block const, only allow based on state external to the script, (<script> tag or command line parameter), or a "use strict" style pragma in-band.  Whilst it doesn't currently sound like the ES committee are going to go for another "use strict" like directive, this might be useful for internal development purposes (e.g. "use webkit-harmony").

I'm open to any of these.  FWIW as I noted V8 went with the "external state" solution.  I don't know what the right answer is.

> I doubt anyone relies on the precise behavior of our crufty function-scoped const, so it may end up making sense to replace the classic const implementation with a block-scoped one, rather than supporting multiple incompatible behaviors.

Again, just for what it's worth, V8 preserved the old behavior and added a new const_harmony mode.  I really don't have a good idea about what enabling block const would do in a broader web context.

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