Ruby

merges r24197 from trunk into ruby_1_9_1.¶

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/branches/ruby_1_9_1@24289 b2dd03c8-39d4-4d8f-98ff-823fe69b080e