From dc35896174e73cf64da3e591b3e8580d22589c01 Mon Sep 17 00:00:00 2001
From: Jesse McDonald <nybble41@gmail.com>
Date: Mon, 9 Nov 2009 09:49:09 -0600
Subject: [PATCH] Need to parenthesize "n" in SPECIAL_VALUE macro for
 precedence.

This was causing the type tags to overlap with fixnums.
---
 gc.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gc.h b/gc.h
index f63a618..72bef08 100644
--- a/gc.h
+++ b/gc.h
@@ -25,13 +25,13 @@ typedef intptr_t fixnum_t;
 
 /* Special values (0 <= n < 1024) */
 /* These correspond to objects within the first page of memory */
-#define SPECIAL_VALUE(n)  ((value_t)(4*n+2))
+#define SPECIAL_VALUE(n)  ((value_t)(4*(n)+2))
+#define TYPE_TAG(n)       SPECIAL_VALUE(768+(n))
 #define MAX_SPECIAL       SPECIAL_VALUE(1023)
 
 #define BROKEN_HEART      SPECIAL_VALUE(0)
 #define FALSE_VALUE       SPECIAL_VALUE(1)
 #define TRUE_VALUE        SPECIAL_VALUE(2)
-#define TYPE_TAG(n)       SPECIAL_VALUE(2+(n))
 
 #define TYPE_TAG_BOX      TYPE_TAG(0)
 #define TYPE_TAG_VECTOR   TYPE_TAG(1)