error[E0710]: unknown tool name `foo` found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:1:9
   |
LL | #![deny(foo::bar)]
   |         ^^^
   |
   = help: add `#![register_tool(foo)]` to the crate root

error[E0710]: unknown tool name `foo` found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:4:9
   |
LL | #[allow(foo::bar)]
   |         ^^^
   |
   = help: add `#![register_tool(foo)]` to the crate root

error[E0710]: unknown tool name `foo` found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:1:9
   |
LL | #![deny(foo::bar)]
   |         ^^^
   |
   = help: add `#![register_tool(foo)]` to the crate root

error[E0710]: unknown tool name `foo` found in scoped lint: `foo::bar`
  --> $DIR/unknown-lint-tool-name.rs:4:9
   |
LL | #[allow(foo::bar)]
   |         ^^^
   |
   = help: add `#![register_tool(foo)]` to the crate root

error: aborting due to 4 previous errors

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