error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:14:8
   |
LL |     ( $()* ) => {};
   |        ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:16:8
   |
LL |     ( $()+ ) => {};
   |        ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:22:9
   |
LL |     ( [$()*] ) => {};
   |         ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:24:9
   |
LL |     ( [$()+] ) => {};
   |         ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:30:8
   |
LL |     ( $($()* $(),* $(a)* $(a),* )* ) => {};
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:32:8
   |
LL |     ( $($()* $(),* $(a)* $(a),* )+ ) => {};
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:38:12
   |
LL |     ( $(a $()+)* ) => {};
   |            ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:40:12
   |
LL |     ( $(a $()*)+ ) => {};
   |            ^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:48:18
   |
LL |     (a $e1:expr $($(, a $e2:expr)*)*) => ([$e1 $($(, $e2)*)*]);
   |                  ^^^^^^^^^^^^^^^^^^

error: repetition matches empty token tree
  --> $DIR/issue-5067.rs:60:8
   |
LL |     ( $()* ) => {}
   |        ^^

error: aborting due to 10 previous errors