From 37c2c316c6e196b7729b7b4a90d13c57bf65e225 Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Tue, 9 Jun 2026 14:45:14 +0200
Subject: [PATCH] test_broadcast: derive from std::exception

---
 tests/test_broadcast.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/test_broadcast.cpp b/tests/test_broadcast.cpp
index 865a978275..3899b705c6 100644
--- a/tests/test_broadcast.cpp
+++ b/tests/test_broadcast.cpp
@@ -29,12 +29,17 @@
 #include <opm/simulators/utils/MPISerializer.hpp>
 #include <dune/common/parallel/mpihelper.hh>
 
+#include <exception>
 #include <numeric>
 
 #if HAVE_MPI
-struct MPIError
+struct MPIError : public std::exception
 {
     MPIError(std::string s, int e) : errorstring(std::move(s)), errorcode(e){}
+
+    const char* what() const noexcept override
+    { return errorstring.c_str(); }
+
     std::string errorstring;
     int errorcode;
 };