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Move non-ascii-idents content from unstable book to reference. #999

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Apr 19, 2021
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Move non-ascii-idents content from unstable book to reference. #999

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18 changes: 12 additions & 6 deletions src/identifiers.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,8 @@

> **<sup>Lexer:<sup>**\
> IDENTIFIER_OR_KEYWORD :\
> &nbsp;&nbsp; &nbsp;&nbsp; \[`a`-`z` `A`-`Z`]&nbsp;\[`a`-`z` `A`-`Z` `0`-`9` `_`]<sup>\*</sup>\
> &nbsp;&nbsp; | `_` \[`a`-`z` `A`-`Z` `0`-`9` `_`]<sup>+</sup>
> &nbsp;&nbsp; &nbsp;&nbsp; XID_start XID_continue<sup>\*</sup>\
> &nbsp;&nbsp; | `_` XID_continue<sup>+</sup>
>
> RAW_IDENTIFIER : `r#` IDENTIFIER_OR_KEYWORD <sub>*Except `crate`, `self`, `super`, `Self`*</sub>
>
Expand All @@ -12,18 +12,22 @@
> IDENTIFIER :\
> NON_KEYWORD_IDENTIFIER | RAW_IDENTIFIER

An identifier is any nonempty ASCII string of the following form:
An identifier is any nonempty Unicode string of the following form:

Either

* The first character is a letter.
* The remaining characters are alphanumeric or `_`.
* 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 are alphanumeric or `_`.
* The remaining characters have property [`XID_continue`].

> **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.

A raw identifier is like a normal identifier, but prefixed by `r#`. (Note that
the `r#` prefix is not included as part of the actual identifier.)
Expand All @@ -32,3 +36,5 @@ keyword except the ones listed above for `RAW_IDENTIFIER`.

[strict]: keywords.md#strict-keywords
[reserved]: keywords.md#reserved-keywords
[`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=