Use proc-macro2's Span instead of our own
diff --git a/tests/test_generics.rs b/tests/test_generics.rs
index 96732a9..d24bc6e 100644
--- a/tests/test_generics.rs
+++ b/tests/test_generics.rs
@@ -9,7 +9,7 @@
 extern crate quote;
 
 extern crate proc_macro2;
-use proc_macro2::Term;
+use proc_macro2::{Span, Term};
 
 mod common;