Add Slice dependency on type_traits for is_const, add_pointer
diff --git a/gen/src/builtin.rs b/gen/src/builtin.rs
index 621d88c..8e6744e 100644
--- a/gen/src/builtin.rs
+++ b/gen/src/builtin.rs
@@ -59,6 +59,7 @@
     }
 
     if builtin.rust_slice {
+        include.type_traits = true;
         builtin.friend_impl = true;
     }