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Add cfg(true) and cfg(false) to conditional compilation (RFC 3695) #1762

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Add cfg(true) and cfg(false) to conditional compilation (RFC 3695) #1762

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6 changes: 5 additions & 1 deletion src/conditional-compilation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@ r[cfg.syntax]
>       _ConfigurationOption_\
>    | _ConfigurationAll_\
>    | _ConfigurationAny_\
>    | _ConfigurationNot_
>    | _ConfigurationNot_\
>    | `true` | `false`
>
> _ConfigurationOption_ :\
> &nbsp;&nbsp; [IDENTIFIER]&nbsp;(`=` ([STRING_LITERAL] | [RAW_STRING_LITERAL]))<sup>?</sup>
Expand Down Expand Up @@ -49,6 +50,9 @@ r[cfg.predicate.any]
r[cfg.predicate.not]
* `not()` with a configuration predicate. It is true if its predicate is false and false if its predicate is true.

r[cfg.predicate.literal]
* `true` or `false` literals, which are always `true`/`false` respectively.

r[cfg.option-spec]
_Configuration options_ are either names or key-value pairs, and are either set or unset.

Expand Down