Existential Operator / Null Propagation Operator

Ron Buckton Ron.Buckton at microsoft.com
Wed Apr 8 02:12:11 UTC 2015


Oops, was think in batch for a minute there.

Sent from my Windows Phone
________________________________
From: Brendan Eich<mailto:brendan at mozilla.org>
Sent: ‎4/‎7/‎2015 6:23 PM
To: Ron Buckton<mailto:Ron.Buckton at microsoft.com>
Cc: Caitlin Potter<mailto:caitpotter88 at gmail.com>; es-discuss at mozilla.org<mailto:es-discuss at mozilla.org>
Subject: Re: Existential Operator / Null Propagation Operator

Ron Buckton wrote:
>> >  The reduce/reduce conflict recognizing a left sentential form '[' E ']'
>> >  vs. M '?' '[' E ']' shows the fatal ambiguity.
>> >
>> >  /be
>
> There is also ambiguity due to ASI vs. a ConditionalExpression:
>
> ```
> obj ? [ expr ]
> :label
> ```
>
> Ron

Colon goes after label :-P. But the problem is bounded lookahead,
ideally k=1. We are not specifying backtracking...

/be
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