B.3.1 The __proto__ pseudo property

Allen Wirfs-Brock allen at wirfs-brock.com
Tue Apr 23 08:55:09 PDT 2013


On Apr 23, 2013, at 5:18 PM, Andreas Rossberg wrote:

> On 23 April 2013 17:10, Mark S. Miller <erights at google.com> wrote:
>> [*] I say "probably" to hedge my bets. The hard constraint we absolutely
>> require is already guaranteed by ES5: That the [[Prototype]] of a
>> non-extensible object cannot be mutated.
> 
> I'm confused now. How does ES5 guarantee that?

See http://ecma-international.org/ecma-262/5.1/#sec-8.6.2 third paragraph beyond table 8

Allen
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