error[E0710]: an unknown tool name found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:13:9
   |
LL | #![deny(foo::bar)] //~ ERROR an unknown tool name found in scoped lint: `foo::bar`
   |         ^^^

error[E0710]: an unknown tool name found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:15:9
   |
LL | #[allow(foo::bar)] //~ ERROR an unknown tool name found in scoped lint: `foo::bar`
   |         ^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0710`.