use rb_enc_get to get the encoding of a Regexp object.

* re.c (reg_enc_error): use rb_enc_get to get the encoding of
  a Regexp object. REGEXP(re)->ptr->enc is the encoding of the
  regexp engin for patterns and target strings.
  [ruby-core:23208]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Sat Jul 18 23:44:59 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* re.c (reg_enc_error): use rb_enc_get to get the encoding of
+	  a Regexp object. REGEXP(re)->ptr->enc is the encoding of the
+	  regexp engin for patterns and target strings.
+	  [ruby-core:23208]
+
 Sat Jul 18 17:43:12 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_hash_cmp): got rid of overflow.

re.c

@@ -1181,7 +1181,7 @@ reg_enc_error(VALUE re, VALUE str)
 {
     rb_raise(rb_eEncCompatError,
 	     "incompatible encoding regexp match (%s regexp with %s string)",
-	     rb_enc_name(RREGEXP(re)->ptr->enc),
+	     rb_enc_name(rb_enc_get(re)),
 	     rb_enc_name(rb_enc_get(str)));
 }