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Add clarification on std::cfg macro docs v. #[cfg] attribute #71692

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Apr 30, 2020
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Add clarification on std::cfg macro docs v. #[cfg] attribute #71692

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Add clarification on std::cfg macro docs v. #[cfg] attribute
dfreese Apr 29, 2020
610f944
Update src/libcore/macros/mod.rs
dfreese Apr 29, 2020
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4 changes: 4 additions & 0 deletions src/libcore/macros/mod.rs
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Expand Up @@ -1159,6 +1159,10 @@ pub(crate) mod builtin {
/// The syntax given to this macro is the same syntax as the [`cfg`]
/// attribute.
///
/// `cfg!`, unlike `#[cfg]`, does not remove any code and only evaluates to true or false. For
/// example, all blocks in an if/else expression need to be valid when `cfg!` is used for
/// the condition, regardless of what `cfg!` is evaluating.
///
/// [`cfg`]: ../reference/conditional-compilation.html#the-cfg-attribute
///
/// # Examples
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