From 62616b88a66a71423c4a26eecef063020891cd4a Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Thu, 19 Oct 2017 06:06:13 -0700
Subject: [PATCH] Workaround a bug in MSVC's constexpr handling

---
 fmt/format.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fmt/format.h b/fmt/format.h
index 800daa95..7110827e 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -3024,7 +3024,11 @@ constexpr unsigned parse_nonnegative_int(Iterator &it) {
   assert('0' <= *it && *it <= '9');
   unsigned value = 0;
   do {
-    unsigned new_value = value * 10 + (*it++ - '0');
+    unsigned new_value = value * 10 + (*it - '0');
+    // Workaround for MSVC "setup_exception stack overflow" error:
+    auto next = it;
+    ++next;
+    it = next;
     // Check if value wrapped around.
     if (new_value < value) {
       value = (std::numeric_limits<unsigned>::max)();