Ruby » Ruby master

merge revision(s) 49201,49203: [Backport #10727]

    * eval_error.c (error_print): pos and len parameters of rb_str_substr()
      are counted by characters, not bytes.  use rb_str_subseq() instead.
      [Bug #10727] [ruby-core:67473]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49298 b2dd03c8-39d4-4d8f-98ff-823fe69b080e