Implementations are allowed to extend objects. Otherwise presence of global/console/// would violate spec...
On 10/01/17 20:21, Boris Zbarsky wrote: > On 1/10/17 2:10 PM, Raul-Sebastian Mihăilă wrote: >> Do you mean that an implementation is allowed to return an exotic object >> from the Error constructor? > > No, I'm saying some implementations do that, because they want to > implement a non-standard "stack" property and the only way to get > reasonable behavior (as those implementations define "reasonable") for > it is to have the object be an exotic object. > > There are other implementation strategies for "stack" that don't > involve an exotic Error object, of course (e.g. SpiderMonkey > implements it as an accessor property on Error.prototype). They have > their own tradeoffs, though. > >> Not returning an ordinary object from the Error constructor is >> non-conformant and, assuming that conformance is a requirement for V8, >> it's a bug. > > Sure, just like arguably the presence of the "stack" property to start > with is a bug, because per spec it's totally unexpected. > > -Boris > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss
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