* transcode.c (str_transcode): check last hash only if 0 < argc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Aug 24 13:27:42 2008  Tanaka Akira  <akr@fsij.org>
+
+	* transcode.c (str_transcode): check last hash only if 0 < argc.
+
 Sun Aug 24 12:22:15 2008  Tanaka Akira  <akr@fsij.org>
 
 	* include/ruby/encoding.h (rb_econv_substr_append): renamed from

transcode.c

@@ -1687,7 +1687,10 @@ str_transcode(int argc, VALUE *argv, VALUE *self)
     VALUE opt;
     int options = 0;
 
-    opt = rb_check_convert_type(argv[argc-1], T_HASH, "Hash", "to_hash");
+    if (0 < argc)
+        opt = rb_check_convert_type(argv[argc-1], T_HASH, "Hash", "to_hash");
+    else
+        opt = Qnil;
     if (!NIL_P(opt)) {
 	VALUE v;