From cc24146adc931f1797c8469faa9fa9e68c8d4a47 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 21 Nov 2005 13:52:49 +0000
Subject: [PATCH] * parse.y (dsym): prohibit empty symbol literal by
 interpolation.   fixed: [ruby-talk:166529]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9579 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 5 ++++-
 parse.y   | 9 ++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 85b683765b..687b51fdbe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,11 @@
-Mon Nov 21 22:19:33 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Mon Nov 21 22:50:48 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* file.c (rb_path_skip_prefix, rb_file_s_basename): UNC without path
 	  should not be splitted.  fixed: [ruby-dev:27776] [ruby-dev:27786]
 
+	* parse.y (dsym): prohibit empty symbol literal by interpolation.
+	  fixed: [ruby-talk:166529]
+
 Mon Nov 21 16:03:48 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/setup.mk: findstr doesn't exist on win9x.
diff --git a/parse.y b/parse.y
index dc56a4fe2d..e9193c7fdb 100644
--- a/parse.y
+++ b/parse.y
@@ -3864,12 +3864,19 @@ dsym		: tSYMBEG xstring_contents tSTRING_END
 			    yyerror("empty symbol literal");
 			}
 			else {
+			    VALUE lit;
+
 			    switch (nd_type($$)) {
 			      case NODE_DSTR:
 				nd_set_type($$, NODE_DSYM);
 				break;
 			      case NODE_STR:
-				if (strlen(RSTRING($$->nd_lit)->ptr) == RSTRING($$->nd_lit)->len) {
+				lit = $$->nd_lit;
+				if (RSTRING(lit)->len == 0) {
+				    yyerror("empty symbol literal");
+				    break;
+				}
+				if (strlen(RSTRING(lit)->ptr) == RSTRING(lit)->len) {
 				    $$->nd_lit = ID2SYM(rb_intern(RSTRING($$->nd_lit)->ptr));
 				    nd_set_type($$, NODE_LIT);
 				    break;