1 files changed, 19 insertions, 0 deletions
diff --git a/rfc2822/src/macros.rs b/rfc2822/src/macros.rs
new file mode 100644
index 00000000..9418f2e2
--- /dev/null
+++ b/rfc2822/src/macros.rs
@@ -0,0 +1,19 @@
+// Turns an `if let` into an expression so that it is possible to do
+// things like:
+//
+// ```rust,nocompile
+// if destructures_to(Foo::Bar(_) = value)
+//    || destructures_to(Foo::Bam(_) = value) { ... }
+// ```
+macro_rules! destructures_to {
+    ( $error: pat = $expr:expr ) => {
+        {
+            let x = $expr;
+            if let $error = x {
+                true
+            } else {
+                false
+            }
+        }
+    };
+}