From 0992bd9c06b90c8f316187467bcc005cbe51050e Mon Sep 17 00:00:00 2001
From: Chong Yidong
Date: Tue, 7 Feb 2012 14:34:52 +0800
Subject: Fix and doc-fix for `buffer-local-variables'.

* src/buffer.c (Fbuffer_local_variables)
(buffer_lisp_local_variables): Handle unbound vars correctly;
don't let Qunbound leak into Lisp.

* doc/lispref/variables.texi (Creating Buffer-Local): Minor clarification
to buffer-local-variables doc.

Fixes: debbugs:10715
---
 src/buffer.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'src/buffer.c')

diff --git a/src/buffer.c b/src/buffer.c
index 01418956c8d..a6f61a1936a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1022,7 +1022,10 @@ buffer_lisp_local_variables (struct buffer *buf)
       if (buf != current_buffer)
 	val = XCDR (elt);
 
-      result = Fcons (Fcons (XCAR (elt), val), result);
+      result = Fcons (EQ (val, Qunbound)
+		      ? XCAR (elt)
+		      : Fcons (XCAR (elt), val),
+		      result);
     }
 
   return result;
@@ -1064,9 +1067,12 @@ No argument or nil as argument means use current buffer as BUFFER.  */)
 	idx = PER_BUFFER_IDX (offset);
 	if ((idx == -1 || PER_BUFFER_VALUE_P (buf, idx))
 	    && SYMBOLP (PER_BUFFER_SYMBOL (offset)))
-	  result = Fcons (Fcons (PER_BUFFER_SYMBOL (offset),
-				 PER_BUFFER_VALUE (buf, offset)),
-			  result);
+	  {
+	    Lisp_Object sym = PER_BUFFER_SYMBOL (offset);
+	    Lisp_Object val = PER_BUFFER_VALUE (buf, offset);
+	    result = Fcons (EQ (val, Qunbound) ? sym : Fcons (sym, val),
+			    result);
+	  }
       }
   }
 
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