You seem to be misunderstanding me
> On Nov 7, 2015, at 12:18 PM, Eric Suen <[email protected]> wrote: > > get/set/as/from/target are valid Identifier, it can't be reserved words > >> On Sun, Nov 8, 2015 at 1:06 AM, Caitlin Potter <[email protected]> >> wrote: >> It should be reserved, logically — but the spec does not explicitly forbid >> this. Unless you take Allen’s “it’s a bold sequence of characters, >> therefore…” argument, which is all well and good, but is only really >> explained in the spec in http://tc39.github.io/ecma262/#sec-grammar-notation >> in the first paragraph — and then further, unicode escapes tend to be >> eagerly converted, so “appear in a script exactly as written” can be >> misleading. Explicit static semantics work a lot better for this sort of >> thing, as they can be easily referenced. >> >> So, in that case, it’s SpiderMonkey with the bug in the case of accessor >> methods, and Chrome without it, while Firefox behaves correctly with escaped >> `new . target`, and Chrome doesn’t. >> >> >> On Nov 7, 2015, at 11:57 AM, Eric Suen <[email protected]> wrote: >> >> So escaped ReservedWords are not valid as ReservedWords nor >> Identifier, what is it then? >> >> And in export { IdentifierName }, why it's IdentifierName not >> Identifier. since IdentifierName only valid as Property in >> ObjectLiteral or Method in Class, is there any way to define >> ReservedWords as local name? >> >> 'get'/'set' is ContextuallyReservedIdentifier, maybe that's the reason? >> >> >> On Sat, Nov 7, 2015 at 11:32 PM, Caitlin Potter <[email protected]> >> wrote: >> >> That it works in Chrome is a bug, which will hopefully be fixed by Monday or >> Tuesday! >> >> Per http://tc39.github.io/ecma262/#sec-keywords, “new” is a Keyword, which >> makes it a ReservedWord. >> >> Per >> http://tc39.github.io/ecma262/#sec-identifiers-static-semantics-early-errors, >> under the >> “Identifier: IdentifierName but not ReservedWord” section, the second early >> error applies here. This applies to >> `new`, which is always a reserved word. So whenever an Identifier is >> expected, if it contains UnicodeEscapeSequences which result in the same >> StringValue as a ReservedWord, it’s an error. >> >> The spec is similarly explicit in saying that escaped ReservedWords are not >> valid as ReservedWords. Browsers behave differently here (for instance, >> http://jsfiddle.net/jd51pqae/ <<< at the time of this writing Webkit Nightly >> prints the text, while other browsers SyntaxError. in Chromes case, this is >> because it’s tokenized as an Identifier, so the second Identifier “f” is >> unexpected when parsing a MemberExpression. SpiderMonkey is doing a nice job >> of reporting clean errors for this kind of thing, that are easier to >> understand. >> >> There are some odd points though: >> >> 1. ReservedWord restrictions never apply to `get` or `set`, even in >> ObjectLiterals (though currently Chrome fails to treat `g\u{65}t` or >> `s\u{65}t` as an accessor prefix, this is a bug). >> >> 2. In the case of “new.target”, it’s technically legal to write >> `new.t\u{61}rget`, but this mostly just seems like an oversight in the spec. >> >> On Nov 7, 2015, at 9:50 AM, Eric Suen <[email protected]> wrote: >> >> "The ReservedWord definitions are specified as literal sequences of >> specific SourceCharacter elements. A code point in a ReservedWord >> cannot be expressed by a \ UnicodeEscapeSequence." - what does it >> mean? >> >> The following code is valid in Chrome, but invalid in firefox and IE. >> >> var \u006eew = 1; // \u006e = 'n' >> >> and valid in Babel/Traceur, invalid in typescript/esprima... >> >> -- >> ------------------------------------------------ >> Spket IDE - Development Tool for RIA. >> >> http://www.spket.com >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> >> >> >> >> >> -- >> ------------------------------------------------ >> Spket IDE - Development Tool for RIA. >> >> http://www.spket.com > > > > -- > ------------------------------------------------ > Spket IDE - Development Tool for RIA. > > http://www.spket.com _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
