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3 changes: 3 additions & 0 deletions src/doc/reference.md
Original file line number Diff line number Diff line change
Expand Up @@ -77,9 +77,12 @@ An identifier is any nonempty Unicode[^non_ascii_idents] string of the following
gated. This is expected to improve soon.

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`
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