From 2058b51b893f793857d160d184bbeb4e47b8234f Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@univ-fcomte.fr>
Date: Mon, 5 Jul 2021 15:17:29 +0200
Subject: [PATCH] It's an internal error if get_impl returns null. Add an
 assert to be sure.

(and hope to please fbinfer)
---
 src/s4u/s4u_Link.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/s4u/s4u_Link.cpp b/src/s4u/s4u_Link.cpp
index 74ad674909..0f5c751013 100644
--- a/src/s4u/s4u_Link.cpp
+++ b/src/s4u/s4u_Link.cpp
@@ -40,7 +40,9 @@ kernel::resource::LinkImpl* Link::get_impl() const
   xbt_assert(
       get_sharing_policy() != SharingPolicy::SPLITDUPLEX,
       "Impossible to get a LinkImpl* from a Split-Duplex link. You should call this method to each UP/DOWN member");
-  return dynamic_cast<kernel::resource::LinkImpl*>(pimpl_);
+  auto* link_impl = dynamic_cast<kernel::resource::LinkImpl*>(pimpl_);
+  xbt_assert(link_impl != nullptr);
+  return link_impl;
 }
 
 Link* Link::by_name_or_null(const std::string& name)
-- 
2.20.1