From 163b7db94b8c5c54266cae3a12552ce0640bb7b4 Mon Sep 17 00:00:00 2001
From: Jack Stouffer <jack@jackstouffer.com>
Date: Wed, 3 Jan 2018 16:05:59 -0500
Subject: [PATCH] Fix BigInt.toString overload

See https://github.com/dlang/phobos/pull/5991#issuecomment-355122818 for more information
---
 std/bigint.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/bigint.d b/std/bigint.d
index dffb9694c9c..cc47cde9a2b 100644
--- a/std/bigint.d
+++ b/std/bigint.d
@@ -915,7 +915,7 @@ public:
     }
 
     /// ditto
-    void toString(scope void delegate(const(char)[]) sink, ref FormatSpec!char f) const
+    void toString(scope void delegate(const(char)[]) sink, const ref FormatSpec!char f) const
     {
         immutable hex = (f.spec == 'x' || f.spec == 'X');
         if (!(f.spec == 's' || f.spec == 'd' || f.spec =='o' || hex))