diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 76a40dc8a528a..73de423cbc001 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -1175,6 +1175,20 @@ impl<T: Debug> Debug for [T] {
     }
 }
 
+#[stable(feature = "lowerhex_debug", since = "1.2.0")]
+impl<T: LowerHex + Debug> LowerHex for [T] {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        f.debug_list().entries(self.iter()).finish()
+    }
+}
+
+#[stable(feature = "lowerhex_debug", since = "1.2.0")]
+impl<T: UpperHex + Debug> UpperHex for [T] {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        f.debug_list().entries(self.iter()).finish()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Debug for () {
     fn fmt(&self, f: &mut Formatter) -> Result {
diff --git a/src/test/run-pass/ifmt.rs b/src/test/run-pass/ifmt.rs
index c8adb6ccc0ab8..211f04a145aed 100644
--- a/src/test/run-pass/ifmt.rs
+++ b/src/test/run-pass/ifmt.rs
@@ -77,6 +77,13 @@ pub fn main() {
     t!(format!("{:o}", 10_usize), "12");
     t!(format!("{:x}", 10_usize), "a");
     t!(format!("{:X}", 10_usize), "A");
+
+    t!(format!("{:x}", [100]), "[0x64]");
+    t!(format!("{:X}", [100]), "[0X64]");
+
+    t!(format!("{:?}", [100]), "[100]");
+    t!(format!("{:?}", [100]), "[100]");
+
     t!(format!("{}", "foo"), "foo");
     t!(format!("{}", "foo".to_string()), "foo");
     if cfg!(target_pointer_width = "32") {