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Rust 2015 supports Kleene ? macro operator #617

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Jun 9, 2019
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Rust 2015 supports Kleene ? macro operator #617

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8 changes: 2 additions & 6 deletions src/macros-by-example.md
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Expand Up @@ -33,8 +33,8 @@
> _MacroRepSep_ :\
> &nbsp;&nbsp; [_Token_]<sub>_except delimiters and repetition operators_</sub>
>
> _MacroRepOp_<sub>2018+</sub> :\
> &nbsp;&nbsp; `*` | `+` | `?`<sub>2018+</sub>
> _MacroRepOp_ :\
> &nbsp;&nbsp; `*` | `+` | `?`
>
> _MacroTranscriber_ :\
> &nbsp;&nbsp; [_DelimTokenTree_]
Expand Down Expand Up @@ -181,10 +181,6 @@ compiler knows how to expand them properly:
illegal because it does not have the same number. This requirement applies
to every layer of nested repetitions.

> **Edition Differences**: The `?` repetition operator did not exist before the
> 2018 edition. Prior to the 2018 Edition, `?` was an allowed
> separator token, rather than a repetition operator.

## Scoping, Exporting, and Importing

For historical reasons, the scoping of macros by example does not work entirely like
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