1 files changed, 8 insertions, 0 deletions
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 37889c4918b..61a6c199701 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -580,6 +580,14 @@ impl Pat {
             | PatKind::Mac(_) => true,
         }
     }
+
+    /// Is this a `..` pattern?
+    pub fn is_rest(&self) -> bool {
+        match self.node {
+            PatKind::Rest => true,
+            _ => false,
+        }
+    }
 }
 
 /// A single field in a struct pattern