Abide by formatting in 'Debug' implementations.

core/http/src/cookies.rs

@@ -414,8 +414,8 @@ impl<'a> Cookies<'a> {
 impl<'a> fmt::Debug for Cookies<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
-            Cookies::Jarred(ref jar, _) => write!(f, "{:?}", jar),
-            Cookies::Empty(ref jar) => write!(f, "{:?}", jar)
+            Cookies::Jarred(ref jar, _) => jar.fmt(f),
+            Cookies::Empty(ref jar) => jar.fmt(f)
         }
     }
 }

core/lib/src/error.rs

@@ -154,7 +154,7 @@ impl fmt::Debug for LaunchError {
     #[inline]
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         self.mark_handled();
-        write!(f, "{:?}", self.kind())
+        self.kind().fmt(f)
     }
 }
 

core/lib/src/response/response.rs

@@ -1185,7 +1185,7 @@ impl<'r> fmt::Debug for Response<'r> {
         }
 
         match self.body {
-            Some(ref body) => writeln!(f, "{:?}", body),
+            Some(ref body) => body.fmt(f),
             None => writeln!(f, "Empty Body")
         }
     }

core/lib/src/response/stream.rs

@@ -36,7 +36,7 @@ impl<T: Read> Stream<T> {
 
 impl<T: Read + Debug> Debug for Stream<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "Stream({:?})", self.0)
+        f.debug_tuple("Stream").field(&self.0).finish()
     }
 }