Skip to content

Moved details of unstable non-ascii identifiers from the Reference #45250

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Oct 15, 2017
Merged

Moved details of unstable non-ascii identifiers from the Reference #45250

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
8d20030
Moved details of unstable non-ascii identifiers from the Reference to…
brauliobz Oct 13, 2017
8e6119f
Fixed link to keywords page in the reference
brauliobz Oct 13, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
32 changes: 31 additions & 1 deletion src/doc/unstable-book/src/language-features/non-ascii-idents.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -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]: keywords.html#strict-keywords