From: Basil L. Contovounesios <contovob@tcd.ie>
Date: Sat, 21 Aug 2021 21:55:58 +0000 (+0100)
Subject: Fix recent parse-partial-sexp argument validation
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Fix recent parse-partial-sexp argument validation

* src/syntax.c (parse-partial-sexp): Also handle markers as
arguments (bug#49944).  Tweak error message to follow conventions in
"(elisp) Signaling Errors".
---

diff --git a/src/syntax.c b/src/syntax.c
index adc0da730ea..057a4c3b1f5 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3595,8 +3595,8 @@ Sixth arg COMMENTSTOP non-nil means stop after the start of a comment.
   else
     target = TYPE_MINIMUM (EMACS_INT);	/* We won't reach this depth.  */
 
-  if (XFIXNUM (to) < XFIXNUM (from))
-    error ("End position should be larger than start position.");
+  if (fix_position (to) < fix_position (from))
+    error ("End position is smaller than start position");
 
   validate_region (&from, &to);
   internalize_parse_state (oldstate, &state);