1 files changed, 44 insertions, 0 deletions
diff --git a/vendor/mac/src/matches.rs b/vendor/mac/src/matches.rs
new file mode 100644
index 000000000..a788fe478
--- /dev/null
+++ b/vendor/mac/src/matches.rs
@@ -0,0 +1,44 @@
+//! Pattern Matching macros.
+
+/// Returns true if an expression matches a pattern.
+///
+/// # Example
+///
+/// ```
+/// # #[macro_use] extern crate mac;
+///
+/// # fn main() {
+/// assert!(matches!(2, 1 | 2 | 3));
+/// assert!(matches!('x', 'a' ... 'z'));
+/// assert!(!matches!(Some(1), None));
+/// assert!(matches!(Some(42), Some(n) if n == 42));
+/// # }
+/// ```
+#[macro_export]
+macro_rules! matches {
+    ($expr:expr, $($pat:tt)+) => {
+        _tt_as_expr_hack! {
+            match $expr {
+                $($pat)+ => true,
+                _        => false
+            }
+        }
+    }
+}
+
+/// Work around "error: unexpected token: `an interpolated tt`", whatever that
+/// means. (Probably rust-lang/rust#22819.)
+#[doc(hidden)]
+#[macro_export]
+macro_rules! _tt_as_expr_hack {
+    ($value:expr) => ($value)
+}
+
+#[test]
+fn test_matches() {
+    let foo = Some("-12");
+    assert!(matches!(foo, Some(bar) if
+        matches!(bar.as_bytes()[0], b'+' | b'-') &&
+        matches!(bar.as_bytes()[1], b'0'... b'9')
+    ));
+}