filetests: run_passes can take &str, not &String.

cranelift/src/clif-util.rs

@@ -217,7 +217,7 @@ fn main() {
                 rest_cmd.is_present("verbose"),
                 &get_vec(rest_cmd.values_of("pass")),
                 target_val,
-                &rest_cmd.value_of("single-file").unwrap().to_string(),
+                rest_cmd.value_of("single-file").unwrap(),
             ).map(|_time| ())
         }
         ("print-cfg", Some(rest_cmd)) => {

lib/filetests/src/lib.rs

@@ -93,7 +93,7 @@ pub fn run(verbose: bool, files: &[String]) -> TestResult {
 ///
 /// Directories are scanned recursively for test cases ending in `.clif`.
 ///
-pub fn run_passes(verbose: bool, passes: &[String], target: &str, file: &String) -> TestResult {
+pub fn run_passes(verbose: bool, passes: &[String], target: &str, file: &str) -> TestResult {
     let mut runner = TestRunner::new(verbose);
 
     let path = Path::new(file);