Improve checks for recent "File exists" fixup

* src/fileio.c (Finsert_file_contents): Add an assertion (bug#42431).

diff --git a/src/fileio.c b/src/fileio.c
index 49553f3c91f3f86722fd45f1502ba36fe72188e6..b9a57dd5800c9908c11e703de6ba8c420f70e35c 100644 (file)
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -5003,6 +5003,7 @@ by calling `format-decode', which see.  */)
   if (save_errno != 0)
     {
       /* Signal an error if visiting a file that could not be opened.  */
+      eassert (!NILP (visit) && NILP (handler));
       report_file_errno ("Opening input file", orig_filename, save_errno);
     }