master 10f55975d3: Improve checks for recent "File exists" fixup

[Paul Eggert]

branch: master
commit 10f55975d34dd7299f72fdf8d93fd8cbe2e41e25
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>

    Improve checks for recent "File exists" fixup
    
    * src/fileio.c (Finsert_file_contents): Add an assertion (bug#42431).
---
 src/fileio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/fileio.c b/src/fileio.c
index 49553f3c91..b9a57dd580 100644
--- 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);
     }