Re: substitutes for arguments and arguments.callee in ECMAScript 5
On 1/5/11, Allen Wirfs-Brock al...@wirfs-brock.com wrote: [...] the function expression form has a well-defined meaning anywhere including in the compound statement blocks such as if-statements. The meaning of the latter two declaration forms are not defined by the standard when they occur within compound statement blocks. What they do, depends upon the browser. [...] ES5 note uses some terminology that I don't understand. disallow usage? issue a warning? What do those mean? It'd make sense to say throw a SyntaxError. What does it mean to issue a warning? When does it happen? After the misplaced FD early (as early errors)? Or do warnings cause for abrupt completion? I'd prefer An implementation that handles FD as a Statement must issue a warning but I think issue a warning should be defined. -- Garrett ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
Re: substitutes for arguments and arguments.callee in ECMAScript 5
On Jan 6, 2011, at 12:17 AM, Garrett Smith wrote: On 1/5/11, Allen Wirfs-Brock al...@wirfs-brock.com wrote: [...] the function expression form has a well-defined meaning anywhere including in the compound statement blocks such as if-statements. The meaning of the latter two declaration forms are not defined by the standard when they occur within compound statement blocks. What they do, depends upon the browser. [...] ES5 note uses some terminology that I don't understand. I missed the issue a warning there at the bottom of 12, but there's also one in 14.1. disallow usage? issue a warning? What do those mean? It'd make sense to say throw a SyntaxError. What does it mean to issue a warning? When does it happen? After the misplaced FD early (as early errors)? Or do warnings cause for abrupt completion? I'd prefer An implementation that handles FD as a Statement must issue a warning but I think issue a warning should be defined. We are going to ban function declarations in blocks in strict mode, in Firefox 4. We have warning facilitiies too but they can generate a ton of noise without extra latch logic to suppress all but the first and avoid a console-spam storm. We're not going to warn about functions in blocks. A recent function-in-block case we found involved an expectation of hoisting, either to block top (as proposed for Harmony, where the function binding would be block-local) or top of enclosing function or program (as IE and followers do). We evangelized the site successfully to reorder things. FYI, and a hopeful sign. /be ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
Re: substitutes for arguments and arguments.callee in ECMAScript 5
Well, NOTES are non-normative and sometimes it is useful to be intentionally vague in such situations. There is no normative use of warning in the ES5 specification so there is no point in formally defining it. I think the intent of issue a warning should be clear enough to any language implementor. Since, such warnings are not normative requirements, its up to the implementor to decide how they interpret this informative recommendation. allen On Jan 6, 2011, at 12:17 AM, Garrett Smith wrote: On 1/5/11, Allen Wirfs-Brock al...@wirfs-brock.com wrote: [...] the function expression form has a well-defined meaning anywhere including in the compound statement blocks such as if-statements. The meaning of the latter two declaration forms are not defined by the standard when they occur within compound statement blocks. What they do, depends upon the browser. [...] ES5 note uses some terminology that I don't understand. disallow usage? issue a warning? What do those mean? It'd make sense to say throw a SyntaxError. What does it mean to issue a warning? When does it happen? After the misplaced FD early (as early errors)? Or do warnings cause for abrupt completion? I'd prefer An implementation that handles FD as a Statement must issue a warning but I think issue a warning should be defined. -- Garrett ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
