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Improve identifier defintion in the reference #28764

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Oct 1, 2015
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Improve identifier defintion in the reference #28764

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9 changes: 7 additions & 2 deletions src/doc/reference.md
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Expand Up @@ -76,8 +76,13 @@ An identifier is any nonempty Unicode[^non_ascii_idents] string of the following
[^non_ascii_idents]: Non-ASCII characters in identifiers are currently feature
gated. This is expected to improve soon.

- The first character has property `XID_start`
- The remaining characters have property `XID_continue`
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 [keywords][keywords].

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