From c49fc2c723b340420e42000a5ce3e8ce918165e2 Mon Sep 17 00:00:00 2001
From: Colin Snover <github.com@zetafleet.com>
Date: Sun, 8 Aug 2021 14:02:16 -0500
Subject: [PATCH] Add alternate debug output for listing items in the slab

---
 src/lib.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index d277547..1fe5032 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1253,10 +1253,14 @@ where
     T: fmt::Debug,
 {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt.debug_struct("Slab")
-            .field("len", &self.len)
-            .field("cap", &self.capacity())
-            .finish()
+        if fmt.alternate() {
+            fmt.debug_map().entries(self.iter()).finish()
+        } else {
+            fmt.debug_struct("Slab")
+                .field("len", &self.len)
+                .field("cap", &self.capacity())
+                .finish()
+        }
     }
 }