error[E0710]: unknown tool name `abc` found in scoped lint: `abc::my_lint`
  --> $DIR/register-tool-lint.rs:5:9
   |
LL | #![warn(abc::my_lint)]
   |         ^^^
   |
   = help: add `#![register_tool(abc)]` to the crate root

error[E0710]: unknown tool name `abc` found in scoped lint: `abc::my_lint`
  --> $DIR/register-tool-lint.rs:5:9
   |
LL | #![warn(abc::my_lint)]
   |         ^^^
   |
   = help: add `#![register_tool(abc)]` to the crate root
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 2 previous errors

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