From f28a1212c2816d65e7d2e281d1c6d02796a69a22 Mon Sep 17 00:00:00 2001
From: Richard Feldman <oss@rtfeldman.com>
Date: Thu, 2 Jan 2020 02:07:43 -0500
Subject: [PATCH] Add a Debug instance for OptVariable

---
 src/subs.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/subs.rs b/src/subs.rs
index 52409c191a..aed961defc 100644
--- a/src/subs.rs
+++ b/src/subs.rs
@@ -108,6 +108,11 @@ impl OptVariable {
             Some(Variable(self.0))
         }
     }
+
+impl fmt::Debug for OptVariable {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.clone().into_variable().fmt(f)
+    }
 }
 
 impl Into<Option<Variable>> for OptVariable {