From d6337e48ad17648b50fc965ba27c99ceea2f258f Mon Sep 17 00:00:00 2001
From: Yukihiro Matsumoto <matz@ruby-lang.org>
Date: Fri, 1 Jun 2012 23:54:43 +0900
Subject: rest argument offset might be -1 that means empty

---
 src/parse.y | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/parse.y b/src/parse.y
index 55c82c12d..eae9fb373 100644
--- a/src/parse.y
+++ b/src/parse.y
@@ -5163,7 +5163,13 @@ parser_dump(mrb_state *mrb, node *tree, int offset)
 	if (n2->car) {
 	  dump_prefix(offset+2);
 	  printf("rest:\n");
-	  parser_dump(mrb, n2->car, offset+3);
+          if (n2->car == (node*)-1) {
+	    dump_prefix(offset+2);
+	    printf("(empty)\n");
+	  }
+          else {
+	    parser_dump(mrb, n2->car, offset+3);
+	  }
 	}
 	n2 = n2->cdr;
 	if (n2) {
-- 
cgit v1.2.3