Move token extra-traits helpers to tt module
diff --git a/src/attr.rs b/src/attr.rs
index 5cbdee9..375904e 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -8,7 +8,7 @@
 #[cfg(feature = "extra-traits")]
 use std::hash::{Hash, Hasher};
 #[cfg(feature = "extra-traits")]
-use mac::TokenStreamHelper;
+use tt::TokenStreamHelper;
 
 ast_struct! {
     /// Doc-comments are promoted to attributes that have `is_sugared_doc` = true