error[E0658]: compiler plugins are experimental and possibly buggy (see issue #29597) --> $DIR/conf_path_non_string.rs:3:1 | 3 | #![plugin(clippy(conf_file=42))] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add #![feature(plugin)] to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.