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Rollup merge of #45250 - brauliobz:non-ascii-idents-details, r=steveklabnik

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Moved details of unstable non-ascii identifiers from the Reference

Moved details of unstable non-ascii identifiers from the Reference to the Unstable book

r? @steveklabnik
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kennytm 2017-10-15 14:21:52 +08:00 committed by GitHub
commit b6f4cea79d
1 changed files with 31 additions and 1 deletions
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32
src/doc/unstable-book/src/language-features/non-ascii-idents.md
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@ -15,4 +15,34 @@ The `non_ascii_idents` feature adds support for non-ASCII identifiers.
const ε: f64 = 0.00001f64;
const Π: f64 = 3.14f64;
```
```
## Changes to the language reference
> **<sup>Lexer:<sup>**
> IDENTIFIER :
> &nbsp;&nbsp; &nbsp;&nbsp; XID_start XID_continue<sup>\*</sup>
> &nbsp;&nbsp; | `_` XID_continue<sup>+</sup>
An identifier is any nonempty Unicode string of the following form:
Either
* The first character has property [`XID_start`]
* The remaining characters have property [`XID_continue`]
Or
* The first character is `_`
* The identifier is more than one character, `_` alone is not an identifier
* The remaining characters have property [`XID_continue`]
that does _not_ occur in the set of [strict keywords].
> **Note**: [`XID_start`] and [`XID_continue`] as character properties cover the
> character ranges used to form the more familiar C and Java language-family
> identifiers.
[`XID_start`]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Start%3A%5D&abb=on&g=&i=
[`XID_continue`]: http://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3AXID_Continue%3A%5D&abb=on&g=&i=
[strict keywords]: ../reference/keywords.html#strict-keywords