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State in the UAX31 profile description that a lone _ is not an identifier #1129

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Jan 7, 2022
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State in the UAX31 profile description that a lone _ is not an identifier #1129

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2 changes: 2 additions & 0 deletions src/identifiers.md
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Expand Up @@ -27,6 +27,8 @@ The profile used from UAX #31 is:
* Continue := [`XID_Continue`]
* Medial := empty

with the additional constraint that a single underscore character is not an identifier.

> **Note**: Identifiers starting with an underscore are typically used to indicate an identifier that is intentionally unused, and will silence the unused warning in `rustc`.

Identifiers may not be a [strict] or [reserved] keyword without the `r#` prefix described below in [raw identifiers](#raw-identifiers).
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