Display the name of the failed file in tidy/libcoretest

Author: varkor

src/tools/tidy/src/libcoretest.rs

@@ -22,14 +22,21 @@ pub fn check(path: &Path, bad: &mut bool) {
  &libcore_path,
  &mut |subpath| t!(subpath.strip_prefix(&libcore_path)).starts_with("tests"),
  &mut |subpath| {
- if subpath.ends_with(".rs") {
- if t!(read_to_string(subpath)).contains("#[test]") {
- tidy_error!(
- bad,
- "{} contains #[test]; libcore tests must be placed inside \
- `src/libcore/tests/`",
- subpath.display()
- );
+ if let Some("rs") = subpath.extension().and_then(|e| e.to_str()) {
+ match read_to_string(subpath) {
+ Ok(contents) => {
+ if contents.contains("#[test]") {
+ tidy_error!(
+ bad,
+ "{} contains #[test]; libcore tests must be placed inside \
+ `src/libcore/tests/`",
+ subpath.display()
+ );
+ }
+ }
+ Err(err) => {
+ panic!("failed to read file {:?}: {}", subpath, err);
+ }
  }
  }
  },