From 5792fcead7bc379e4d855746b59ae0ade51e1303 Mon Sep 17 00:00:00 2001
From: Jeff Norden <jnoden@tntech.edu>
Date: Fri, 18 Sep 2020 19:34:18 -0500
Subject: [PATCH] Fix bug in forward-comment that allowed the point to move
 before BEGV, and even become negative.

---
 src/syntax.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/syntax.c b/src/syntax.c
index 7f0fc34..3dcc7ec 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -2542,7 +2542,7 @@ between them, return t; otherwise return nil.  */)
 	      bool fence_found = 0;
 	      ptrdiff_t ini = from, ini_byte = from_byte;
 
-	      while (1)
+	      while (from > stop)
 		{
 		  dec_both (&from, &from_byte);
 		  UPDATE_SYNTAX_TABLE_BACKWARD (from);
@@ -2553,8 +2553,6 @@ between them, return t; otherwise return nil.  */)
 		      fence_found = 1;
 		      break;
 		    }
-		  else if (from == stop)
-		    break;
 		  rarely_quit (++quit_count);
 		}
 	      if (fence_found == 0)
-- 
2.7.4