This is now https://bugs.ecmascript.org/show_bug.cgi?id=79
On Mar 21, 2011, at 11:44 AM, Jim Blandy wrote: > This is a bug in the spec, and has been previously discussed here: > > https://mail.mozilla.org/pipermail/es5-discuss/2010-November/003839.html > > (Thanks, Jeff!) > > On 03/20/2011 11:22 PM, Jim Blandy wrote: >> >> When executing this code: >> (function () { >> eval("var x=delete(x)") >> })() >> I think the assertion in the ECMAScript description of the declarative >> environment record's SetMutableBinding algorithm, 10.2.1.1.3 step 2, fails. >> On entry to the function, we create a lexical environment with a declarative >> environment record (10.4.3). >> When we enter the eval code, we create the binding for 'x' in that >> environment record (10.5, step 8.c.1). This is a deletable binding, as per >> 10.5 step 2. >> When we evaluate the declaration, we produce a reference with that >> environment record as its base, delete the binding, and then call PutValue >> (12.2, VariableDeclaration : Identifier Initialiser semantics). >> PutValue calls the environment record's SetMutableBinding concrete method >> (8.7.2 step 5.a). >> SetMutableBinding's assertion fails, because 'x' is no longer bound in that >> environment record (10.2.1.1.3 step 2). >> Have I missed something? >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss
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