From f48d3859bc90e6e8a2e5455845b13d55bb8720ab Mon Sep 17 00:00:00 2001
From: Corey Farwell <coreyf@rwell.org>
Date: Mon, 29 Aug 2016 07:17:27 -0400
Subject: [PATCH 1/2] Implement `Debug` for `std::path::Components`.

---
 src/libstd/path.rs | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index 67219b6fd1b9c..791b7b2288d5d 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -639,6 +639,25 @@ pub struct Iter<'a> {
     inner: Components<'a>,
 }
 
+#[stable(feature = "path_components_debug", since = "1.13.0")]
+impl<'a> fmt::Debug for Components<'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.components())
+                    .finish()
+            }
+        }
+
+        f.debug_tuple("Components")
+            .field(&DebugHelper(self.as_path()))
+            .finish()
+    }
+}
+
 impl<'a> Components<'a> {
     // how long is the prefix, if any?
     #[inline]
@@ -3483,4 +3502,25 @@ mod tests {
                 );
         }
     }
+
+    #[test]
+    fn test_components_debug() {
+        let path = Path::new("/tmp");
+
+        let mut components = path.components();
+
+        let expected = "Components([RootDir, Normal(\"tmp\")])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+
+        let _ = components.next().unwrap();
+        let expected = "Components([Normal(\"tmp\")])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+
+        let _ = components.next().unwrap();
+        let expected = "Components([])";
+        let actual = format!("{:?}", components);
+        assert_eq!(expected, actual);
+    }
 }

From 268b3f58184cc7efa8196a28cccffcc01a5d61ac Mon Sep 17 00:00:00 2001
From: Corey Farwell <coreyf@rwell.org>
Date: Tue, 30 Aug 2016 09:29:22 -0400
Subject: [PATCH 2/2] Implement `Debug` for `std::path::Iter`.

---
 src/libstd/path.rs | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index 791b7b2288d5d..dbf17b3c813f6 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -837,6 +837,25 @@ impl<'a> AsRef<OsStr> 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 +3542,26 @@ mod tests {
         let actual = format!("{:?}", components);
         assert_eq!(expected, actual);
     }
+
+    #[cfg(unix)]
+    #[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);
+    }
 }