tweak failure output a little

Author: RalfJung

ui_test/src/lib.rs

@@ -164,11 +164,11 @@ pub fn run_tests(config: Config) -> Result<()> {
     if !failures.is_empty() {
         for (path, miri, revision, errors, stderr) in &failures {
             eprintln!();
-            eprint!("{}", path.display().to_string().underline());
+            eprint!("{}", path.display().to_string().underline().bold());
             if !revision.is_empty() {
                 eprint!(" (revision `{}`)", revision);
             }
-            eprint!(" {}", "FAILED".red());
+            eprint!(" {}", "FAILED:".red().bold());
             eprintln!();
             eprintln!("command: {:?}", miri);
             eprintln!();
@@ -223,7 +223,7 @@ pub fn run_tests(config: Config) -> Result<()> {
             eprintln!("{}", stderr);
             eprintln!();
         }
-        eprintln!("{}", "failures:".red().underline());
+        eprintln!("{}", "FAILURES:".red().underline().bold());
         for (path, _miri, _revision, _errors, _stderr) in &failures {
             eprintln!("    {}", path.display());
         }