Fix unused warning on inner_attr
diff --git a/src/attr.rs b/src/attr.rs
index 068e0ee..0819f1c 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -80,6 +80,7 @@
     use lit::{Lit, StrStyle};
     use lit::parsing::lit;
 
+    #[cfg(feature = "full")]
     named!(pub inner_attr -> Attribute, do_parse!(
         punct!("#") >>
         punct!("!") >>