servo: Merge #7429 - Fixed serialize_list to no longer append an additional space at the e… (from GyrosOfWar:serialize_list_space_fix); r=jdm

…nd of the string.

Fixes #7404

Source-Repo: https://github.com/servo/servo
Source-Revision: e1ede2074d2ceb74c0d9f38b23697f17dc3a8fc9

servo/components/script/lib.rs

@@ -30,6 +30,7 @@
 #![feature(str_utf16)]
 #![feature(unicode)]
 #![feature(vec_push_all)]
+#![feature(slice_concat_ext)]
 
 #![deny(unsafe_code)]
 #![allow(non_snake_case)]