error[E0710]: an unknown tool name found in scoped lint: `foo::bar` --> $DIR/tool_lints.rs:1:8 | LL | #[warn(foo::bar)] | ^^^ error[E0710]: an unknown tool name found in scoped lint: `foo::bar` --> $DIR/tool_lints.rs:1:8 | LL | #[warn(foo::bar)] | ^^^ error[E0710]: an unknown tool name found in scoped lint: `foo::bar` --> $DIR/tool_lints.rs:1:8 | LL | #[warn(foo::bar)] | ^^^ error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0710`.