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Auto merge of #30080 - durka:patch-10, r=alexcrichton

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Fixes #30073. The input to `cfg!` is a meta attribute, but not _any_ meta attribute (e.g. `cfg!(allow(dead_code))` doesn't compile). But the macro_rules syntax can't quite express this, so I added a note to the doc.
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bors 2015-11-30 21:15:56 +00:00
commit 7269f0e9f3
1 changed files with 4 additions and 4 deletions
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8
src/libstd/macros.rs
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@ -472,8 +472,8 @@ pub mod builtin {
/// boolean expression evaluation of configuration flags. This frequently
/// leads to less duplicated code.
///
/// The syntax given to this macro is the same syntax as the `cfg`
/// attribute.
/// The syntax given to this macro is the same syntax as [the `cfg`
/// attribute](../reference.html#conditional-compilation).
///
/// # Examples
///
@ -486,7 +486,7 @@ pub mod builtin {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[macro_export]
macro_rules! cfg { ($cfg:tt) => ({ /* compiler built-in */ }) }
macro_rules! cfg { ($($cfg:tt)*) => ({ /* compiler built-in */ }) }
/// Parse the current given file as an expression.
///
@ -501,5 +501,5 @@ pub mod builtin {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[macro_export]
macro_rules! include { ($cfg:tt) => ({ /* compiler built-in */ }) }
macro_rules! include { ($file:expr) => ({ /* compiler built-in */ }) }
}