error: invalid fragment specifier `t_ty`
  --> $DIR/unused-macro-with-bad-frag-spec.rs:6:6
   |
LL |     ($wrong:t_ty) => ()
   |      ^^^^^^^^^^^
   |
   = help: valid fragment specifiers are `ident`, `block`, `stmt`, `expr`, `pat`, `ty`, `lifetime`, `literal`, `path`, `meta`, `tt`, `item` and `vis`

error: aborting due to previous error