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/// Provides the ability to define `#[cfg]` statements for multiple items
///
/// ### Examples
/// ```ignore
/// use fungus::prelude::*;
///
/// cfgblk! {
///     #[cfg(feature = "foo")])
///     use libc;
///     use std::ffi::CString;
/// }
///
/// // Expands to
/// #[cfg(feature = "foo")])
/// use libc;
/// #[cfg(feature = "foo")])
/// use std::ffi::CString;
/// ```
#[macro_export]
macro_rules! cfgblock {

    // Handle a single item
    (#[$attr:meta] $item:item) => {
        #[$attr] $item
    };

    // Handle more than one item recursively
    (#[$attr:meta] $($tail:item)*) => {
        $(cfgblock!{#[$attr] $tail})*
    };
}