error[E0602]: unknown lint tool: `unknown_tool`
   |
   = note: requested on the command line with `-A unknown_tool::foo`

error[E0602]: unknown lint tool: `unknown_tool`
   |
   = note: requested on the command line with `-A unknown_tool::foo`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0602`.