src/test/ui/proc-macro/issue-76270-panic-in-libproc-macro.stderr

error: proc macro panicked
  --> $DIR/issue-76270-panic-in-libproc-macro.rs:10:1
   |
LL | proc_macro_panic::panic_in_libproc_macro!();
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: message: `""` is not a valid identifier

error: aborting due to previous error