* eval_error.c (warn_printf): use rb_vsprintf instead so ruby specific
	  extensions like PRIsVALUE can be used in format strings

	* eval_error.c (error_print): use warn_print_str (alias for
	  rb_write_error_str) to print a string value instead of using
	  RSTRING_PTR and RSTRING_LEN manually

	* eval.c (setup_exception): use PRIsVALUE instead of %s and RSTRING_PTR

	* eval.c (setup_exception): preserve exception class name encoding
	  in debug mode messages.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45253 b2dd03c8-39d4-4d8f-98ff-823fe69b080e