merges r24425 from trunk into ruby_1_9_1.

--
* encoding.c (rb_enc_associate_index): cannot set encoding on
  special constants.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24474 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 96135b8cfa..d6f69a84f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,9 @@ Thu Aug  6 16:25:08 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 	* encoding.c (enc_capable, rb_enc_get_index): Symbol is encoding
 	  capable.
 
+	* encoding.c (rb_enc_associate_index): cannot set encoding on
+	  special constants.
+
 Wed Aug  5 19:11:01 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ruby.c (rb_stdio_set_default_encoding): declared.
diff --git a/encoding.c b/encoding.c
index faebdfac86..bc960c26a7 100644
--- a/encoding.c
+++ b/encoding.c
@@ -617,6 +617,9 @@ rb_enc_associate_index(VALUE obj, int idx)
 /*    enc_check_capable(obj);*/
     if (rb_enc_get_index(obj) == idx)
     	return obj;
+    if (SPECIAL_CONST_P(obj)) {
+	rb_raise(rb_eArgError, "cannot set encoding");
+    }
     if (!ENC_CODERANGE_ASCIIONLY(obj) ||
 	!rb_enc_asciicompat(rb_enc_from_index(idx))) {
 	ENC_CODERANGE_CLEAR(obj);
diff --git a/version.h b/version.h
index 7d70338c66..2fa35f5111 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.1"
-#define RUBY_PATCHLEVEL 278
+#define RUBY_PATCHLEVEL 279
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1