error[E0568]: auto traits cannot have super traits --> $DIR/typeck-auto-trait-no-supertraits-2.rs:4:20 | LL | auto trait Magic : Sized where Option : Magic {} | ----- ^^^^^ help: remove the super traits | | | auto trait cannot have super traits error: aborting due to previous error For more information about this error, try `rustc --explain E0568`.