fix tests including dead_code warnings

Author: TaKO8Ki

tests/testsuite/build.rs

@@ -647,7 +647,7 @@ fn cargo_compile_with_warnings_in_the_root_package() {
         .build();
 
     p.cargo("build")
-        .with_stderr_contains("[..]function is never used: `dead`[..]")
+        .with_stderr_contains("[..]function `dead` is never used[..]")
         .run();
 }
 
@@ -686,7 +686,7 @@ fn cargo_compile_with_warnings_in_a_dep_package() {
         .build();
 
     p.cargo("build")
-        .with_stderr_contains("[..]function is never used: `dead`[..]")
+        .with_stderr_contains("[..]function `dead` is never used[..]")
         .run();
 
     assert!(p.bin("foo").is_file());

tests/testsuite/registry.rs

@@ -1923,7 +1923,7 @@ fn upstream_warnings_on_extra_verbose(cargo: fn(&Project, &str) -> Execs) {
         .publish();
 
     cargo(&p, "build -vv")
-        .with_stderr_contains("[..]warning: function is never used[..]")
+        .with_stderr_contains("[..]warning: function `unused` is never used[..]")
         .run();
 }