Allow testing on stable Rust

Author: alexcrichton

regex_macros/tests/test_dynamic.rs

@@ -8,11 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(test)]
 #![cfg_attr(feature = "pattern", feature(core))]
 
 extern crate regex;
-extern crate test;
 
 // Due to macro scoping rules, this definition only applies for the modules
 // defined below. Effectively, it allows us to use the same tests for both