1 files changed, 71 insertions, 0 deletions
diff --git a/vendor/mac/src/lib.rs b/vendor/mac/src/lib.rs
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+++ b/vendor/mac/src/lib.rs
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+#![cfg_attr(test, deny(warnings))]
+#![deny(missing_docs)]
+
+//! # mac
+//!
+//! A collection of great and ubiqutitous macros.
+//!
+
+pub mod test;
+pub mod mem;
+pub mod format;
+pub mod syntax_ext;
+pub mod matches;
+pub mod inspect;
+pub mod cfg;
+
+/// Unwraps an `Option` or returns from the function with the specified return
+/// value.
+///
+/// Can be used on `Result`s by first calling `.ok()` or `.err()` on them.
+///
+/// # Examples
+///
+/// ```
+/// # #[macro_use] extern crate mac;
+/// fn take_pair<I:Iterator>(iter: &mut I) -> Option<(<I as Iterator>::Item, <I as Iterator>::Item)> {
+///    let first = unwrap_or_return!(iter.next(), None);
+///    Some((first, unwrap_or_return!(iter.next(), None)))
+/// }
+/// # fn main() { }
+/// ```
+#[macro_export]
+macro_rules! unwrap_or_return {
+    ($e:expr, $r:expr) => (match $e { Some(e) => e, None => return $r, })
+}
+
+/// Do-while loop.
+///
+/// # Examples
+///
+/// ```
+/// # #[macro_use] extern crate mac;
+/// # fn main() {
+/// let mut i = 0;
+/// let mut n = 0;
+///
+/// do_while!({
+///     n += i;
+///     i += 1;
+/// } while i < 5);
+///
+/// assert_eq!(n, 10);
+/// # }
+/// ```
+///
+/// The loop always executes at least once.
+///
+/// ```
+/// # #[macro_use] extern crate mac;
+/// # fn main() {
+/// let mut ran = false;
+/// do_while!({ ran = true } while false);
+/// assert!(ran);
+/// # }
+/// ```
+#[macro_export]
+macro_rules! do_while {
+    ($body:block while $condition:expr) => {
+        while { $body; $condition } { }
+    }
+}