we now get an extra unreachable code warning in this test

Author: nikomatsakis

src/test/compile-fail/never-assign-dead-code.rs

@@ -16,5 +16,6 @@
 fn main() {
     let x: ! = panic!("aah"); //~ ERROR unused
     drop(x); //~ ERROR unreachable
+    //~^ ERROR unreachable
 }