From: Tanaka Akira <akr@...17n.org>
Date: 2005-07-30T12:19:55+09:00
Subject: Re: [BUG] takes -1, not 0, arguments

In article <2572ec7805072905422866d465@mail.gmail.com>,
  Ramzi Ferchichi <raziir@gmail.com> writes:

> I got this bug on my system running Ubuntu (breezy):
>
> /usr/lib/ruby/1.8/date/format.rb:598: [BUG] unknown node type 0
> ruby 1.8.3 (2005-06-23) [i486-linux]

Although the bug is too hard to fix without a script to reproduce it,
following patch may show bit more information.

Index: eval.c
===================================================================
RCS file: /src/ruby/eval.c,v
retrieving revision 1.616.2.114
diff -u -p -r1.616.2.114 eval.c
--- eval.c	29 Jul 2005 01:00:07 -0000	1.616.2.114
+++ eval.c	30 Jul 2005 03:13:02 -0000
@@ -2806,7 +2806,15 @@ unknown_node(node)
     NODE *volatile node;
 {
     ruby_current_node = 0;
-    rb_bug("unknown node type %d", nd_type(node));
+    if (node->flags == 0) {
+        rb_bug("terminated node (0x%lx)", node);
+    }
+    else if (BUILTIN_TYPE(node) != T_NODE) {
+        rb_bug("not a node 0x%02lx (0x%lx)", BUILTIN_TYPE(node), node);
+    }
+    else {
+        rb_bug("unknown node type %d (0x%lx)", nd_type(node), node);
+    }
 }
 
 static VALUE
-- 
Tanaka Akira