const VS features detection

Brendan Eich brendan at
Mon Jan 6 08:10:47 PST 2014

David Herman wrote:
> On Dec 20, 2013, at 5:32 AM, Andreas Rossberg<rossberg at>  wrote:
>> >  For ES7 I would like to revive the do-expression proposal (hopefully
>> >  at the next meeting)
> Glad to hear you're in favor! I'll be happy to co-champion.

I will support your prospective championship ;-).

To further constrain design (since design is mostly about leaving things 
out), I will address the ES4-era |let (x = y, z = z /* outer z*/) ...| 
let blocks and let expressions, which came up recently. We should not 
revive these, given do expressions. do-exprs compose better with let and 
const (and other binding form) declarations.

Sorry if this is obvious; wanted to settle it, since it came up here in 
the other thread.


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