diff --git a/src/libstd/path.rs b/src/libstd/path.rs index 791b7b2288d5d..92ebec03b364b 100644 --- a/src/libstd/path.rs +++ b/src/libstd/path.rs @@ -837,6 +837,25 @@ impl<'a> AsRef for Components<'a> { } } +#[stable(feature = "path_iter_debug", since = "1.13.0")] +impl<'a> fmt::Debug for Iter<'a> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + struct DebugHelper<'a>(&'a Path); + + impl<'a> fmt::Debug for DebugHelper<'a> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_list() + .entries(self.0.iter()) + .finish() + } + } + + f.debug_tuple("Iter") + .field(&DebugHelper(self.as_path())) + .finish() + } +} + impl<'a> Iter<'a> { /// Extracts a slice corresponding to the portion of the path remaining for iteration. #[stable(feature = "rust1", since = "1.0.0")] @@ -3523,4 +3542,25 @@ mod tests { let actual = format!("{:?}", components); assert_eq!(expected, actual); } + + #[test] + fn test_iter_debug() { + let path = Path::new("/tmp"); + + let mut iter = path.iter(); + + let expected = "Iter([\"/\", \"tmp\"])"; + let actual = format!("{:?}", iter); + assert_eq!(expected, actual); + + let _ = iter.next().unwrap(); + let expected = "Iter([\"tmp\"])"; + let actual = format!("{:?}", iter); + assert_eq!(expected, actual); + + let _ = iter.next().unwrap(); + let expected = "Iter([])"; + let actual = format!("{:?}", iter); + assert_eq!(expected, actual); + } }