From 67fa6afba5fcb2478cb35530fd8964b9b3639c9a Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 23 Jun 2020 15:14:19 -0600
Subject: [PATCH] Add an assertion.

---
 source/grid/grid_in.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/source/grid/grid_in.cc b/source/grid/grid_in.cc
index f47c7efe10..121f18783f 100644
--- a/source/grid/grid_in.cc
+++ b/source/grid/grid_in.cc
@@ -1971,8 +1971,10 @@ GridIn<dim, spacedim>::read_msh(std::istream &in)
                 unsigned int node_index = 0;
                 if (gmsh_file_format < 20)
                   {
-                    for (unsigned int i = 0; i < nod_num; ++i)
-                      in >> node_index;
+                    // For points (cell_type==15), we can only ever
+                    // list one node index.
+                    AssertThrow(nod_num == 1, ExcInternalError());
+                    in >> node_index;
                   }
                 else
                   {
-- 
2.39.5