Make doc examples compatible with stable
diff --git a/src/ext.rs b/src/ext.rs
index 0a412e4..ae6c2ae 100644
--- a/src/ext.rs
+++ b/src/ext.rs
@@ -18,9 +18,10 @@
     /// identifiers.
     ///
     /// ```rust
-    /// # extern crate syn;
-    /// #
-    /// use syn::{Ident, Token};
+    /// #[macro_use]
+    /// extern crate syn;
+    ///
+    /// use syn::Ident;
     /// use syn::ext::IdentExt;
     /// use syn::parse::{Error, ParseStream, Result};
     ///