* marshal.c (mark_dump_arg): it may be called after dump_ensure.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13961 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Nov 18 20:47:41 2007  Tanaka Akira  <akr@fsij.org>
+
+	* marshal.c (mark_dump_arg): it may be called after dump_ensure.
+
 Sun Nov 18 18:27:47 2007  Tanaka Akira  <akr@fsij.org>
 
 	* time.c (time_minus): fix Time.at(2**60+1) - Time.at(2**60).

marshal.c

@@ -153,6 +153,8 @@ static void
 mark_dump_arg(void *ptr)
 {
     struct dump_arg *p = ptr;
+    if (!ptr)
+        return;
     rb_mark_set(p->data);
     rb_mark_hash(p->compat_tbl);
 }