Require Ident to contain a valid ident
diff --git a/src/lib.rs b/src/lib.rs
index 0519ed1..8e63ac4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,6 +3,7 @@
 #![cfg_attr(feature = "cargo-clippy", allow(large_enum_variant))]
 
 extern crate proc_macro2;
+extern crate unicode_xid;
 
 #[cfg(feature = "printing")]
 extern crate quote;