Clear bug in 15.10.6.2 step 17
17. Call the [[DefineOwnProperty]] internal method of A with arguments
length, Property Descriptor
{[[Value]]: n + 1, [[Writable]: true, [[Enumerable]]: true, [[Configurable]]:
true}, and true.
This is attempting to define an enumerable, configurable length property on an
array, which will throw an exception trying to change the configurability of a
non-configurable property.
Jeff
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RE: Clear bug in 15.10.6.2 step 17
Yes, arguably that step isn't needed at all because step 20.b implicitly sets
the length
-Original Message-
From: es-discuss-boun...@mozilla.org [mailto:es-discuss-
boun...@mozilla.org] On Behalf Of Jeff Walden
Sent: Monday, September 21, 2009 2:32 PM
To: es-discuss@mozilla.org
Subject: Clear bug in 15.10.6.2 step 17
17. Call the [[DefineOwnProperty]] internal method of A with arguments
length, Property Descriptor
{[[Value]]: n + 1, [[Writable]: true, [[Enumerable]]: true,
[[Configurable]]: true}, and true.
This is attempting to define an enumerable, configurable length property
on an array, which will throw an exception trying to change the
configurability of a non-configurable property.
Jeff
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another and possibly final ES5 errata
As usual at http://wiki.ecmascript.org/doku.php?id=es3.1:es3.1_proposal_working_draft Noon Tuesday US Pacific coast time is about the latest I can receive any new issues and get them resolved in time for the Wednesday's meeting where the ES5 spec. will be declared finished. Allen ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
RE: Use subset directive grammar
Nice catch...it looks like I need to mention the semicolon (which may be supplied by automatic semicolon insertion). The parentheses form is not intended to be a directive. allen -Original Message- From: es-discuss-boun...@mozilla.org [mailto:es-discuss- boun...@mozilla.org] On Behalf Of Mike Samuel Sent: Monday, September 21, 2009 6:33 PM To: es-discuss@mozilla.org Subject: Use subset directive grammar From section 14.1 of http://wiki.ecmascript.org/lib/exe/fetch.php?id=es3.1%3Aes3.1_proposal_w orking_draftcache=cachemedia=es3.1:es5-tc392008-040.pdf A Directive Prologue is a sequence of zero or more ExpressionStatement productions, each of which having an Expression consists entirely of a StringLiteral, that occur as the initial SourceElement productions of a Program or FunctionBody. What does consists entirely mean? From the grammar in the appendix, to get from ExpressionStatement to StringLiteral, I have to go through the following grammar chain: ExpressionStatement - AssignmentExpression - ConditionalExpression - (lots of operator precedence elided) - LeftHandSideExpression - NewExpression - MemberExpression - PrimaryExpression - Literal - StringLiteral One way to define consists entirely might be: an A that consists entirely of B if it matches A and B and all tokens were consumed by matching B. That definition is consistent with use strict but not use strict; since the ; is actually part of the ExpressionStatement production. Is there a definition of consists entirely that matches use strict; and use strict but not (use strict); ? Or can the last be part of a directive prologue? ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
Re: another and possibly final ES5 errata
On Mon, Sep 21, 2009 at 6:05 PM, Allen Wirfs-Brock allen.wirfs-br...@microsoft.com wrote: As usual at http://wiki.ecmascript.org/doku.php?id=es3.1:es3.1_proposal_working_draft Noon Tuesday US Pacific coast time is about the latest I can receive any new issues and get them resolved in time for the Wednesday’s meeting where the ES5 spec. will be declared finished. https://mail.mozilla.org/pipermail/es-discuss/2009-September/009816.html Function.prototype.toString Current spec says it must return a string representation that has the syntax of a FunctionDeclaration. Problem is that implementations don't do that with anonymous functions. Proposal to have it return a string representation that has the syntax of a Function Definition (basically legalizes existing behavior in a harmless way). Garrett ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
