extern crate env_logger;
extern crate getopts;
extern crate rustc;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
extern crate rustc_data_structures;
extern crate rustc_driver;
-extern crate rustc_error_codes;
extern crate rustc_errors;
extern crate rustc_expand;
extern crate rustc_feature;