fix: Allow configuration of colons in inlay-hints

crates/test_utils/src/lib.rs

@@ -440,6 +440,7 @@ pub fn bench(label: &'static str) -> impl Drop {
 
 /// Checks that the `file` has the specified `contents`. If that is not the
 /// case, updates the file and then fails the test.
+#[track_caller]
 pub fn ensure_file_contents(file: &Path, contents: &str) {
     if let Err(()) = try_ensure_file_contents(file, contents) {
         panic!("Some files were not up-to-date");