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

[bugzilla-daemon at webkit.org]

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





--- Comment #17 from Andy Wingo <wingo at igalia.com>  2011-11-30 03:35:32 PST ---
Good points regarding modules.

I'm going to work on this a bit more for the rest of the week and weekend (the GTK+ port has a hackfest).  The tentative plan is:

 1. New code is guarded by ENABLE(HARMONY)

 2. There is also Options::harmony, and sub-option Options::harmonyBlockScoping, to allow runtime control, at least until things settle down

 3. Adding an "extended" mode does not seem necessary yet, as the additions are not incompatible with old strict-mode code.  In short, I plan to enable block-scoped `let' and `const' in strict-mode code when the global Options::harmonyBlockScoping flag is on.

 4. We will have to add new binding modes, CONST_HARMONY and LET.

The actual implementation mechanism is likely to be a generalization of what's used by `catch' blocks, but I don't understand everything there yet.

Comments welcome.

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