finish helper functions

src/interfaces/mod.rs

@@ -1,9 +1,12 @@
+
+use crate::proto_gen::phonemetadata::PhoneNumberDesc;
 /// Internal phonenumber matching API used to isolate the underlying
 /// implementation of the matcher and allow different implementations to be
 /// swapped in easily.
+
 pub(crate) trait MatcherApi {
   /// Returns whether the given national number (a string containing only decimal
   /// digits) matches the national number pattern defined in the given
   /// PhoneNumberDesc message.
-  fn match_national_number(number: &str, number_desc: &PhoneNumberDesc, allow_prefix_match: bool) -> bool;
+  fn match_national_number(&self, number: &str, number_desc: &PhoneNumberDesc, allow_prefix_match: bool) -> bool;
 }