Revert "Prefer ‘format’ to ‘substitute-command-keys’"

This reverts commit 6af5aad26411ffe21c3fe4bc5438347110910111.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/syntax.c b/src/syntax.c
index 30560affdf0..d45936b2b28 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -1333,11 +1333,9 @@ DEFUN ("internal-describe-syntax-value", Finternal_describe_syntax_value,
     insert_string (" (nestable)");
 
   if (prefix)
-    {
-      AUTO_STRING (prefixdoc,
-                   ",\n\t  is a prefix character for `backward-prefix-chars'");
-      insert1 (Fsubstitute_command_keys (prefixdoc));
-    }
+    insert1 (Fsubstitute_command_keys
+             (build_string
+              (",\n\t  is a prefix character for `backward-prefix-chars'")));
 
   return syntax;
 }