From 3e992d8bbfa1c587c5fc6ba760d286c9a4977e84 Mon Sep 17 00:00:00 2001
From: Jim Blandy <jimb@red-bean.com>
Date: Mon, 27 Sep 2021 16:17:20 -0700
Subject: [PATCH] Address 'unused variable' warnings when 'span' feature is
 off. (#1433)

---
 src/arena.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/arena.rs b/src/arena.rs
index 5e1c65cf7b..536a4bd280 100644
--- a/src/arena.rs
+++ b/src/arena.rs
@@ -489,6 +489,9 @@ impl<T: Eq + hash::Hash> UniqueArena<T> {
             debug_assert!(self.set.len() == self.span_info.len());
         }
 
+        #[cfg(not(feature = "span"))]
+        let _ = (span, added);
+
         Handle::from_usize(index)
     }