From b8d70919ea6be0d2e4c58ef82887496f55125ba9 Mon Sep 17 00:00:00 2001
From: Paul Dreik <github@pauldreik.se>
Date: Sun, 28 Apr 2019 21:29:43 +0200
Subject: [PATCH] provoke assertion

fmt/include/fmt/core.h:246:
typename std::make_unsigned<_Tp>::type fmt::v5::internal::to_unsigned(Int)
[with Int = long int;
 typename std::make_unsigned<_Tp>::type = long unsigned int]:
Assertion `(value >= 0) && "negative value"' failed.
---
 test/chrono-test.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/chrono-test.cc b/test/chrono-test.cc
index bb546f7b4809..76d93fbf3f16 100644
--- a/test/chrono-test.cc
+++ b/test/chrono-test.cc
@@ -301,4 +301,8 @@ TEST(ChronoTest, InvalidWidthId) {
                fmt::format_error);
 }
 
+TEST(ChronoTest, InvalidColons) {
+  EXPECT_THROW(fmt::format("{0}=:{0::", std::chrono::seconds(0)),
+               fmt::format_error);
+}
 #endif  // FMT_STATIC_THOUSANDS_SEPARATOR