error: repetition matches empty token tree --> $DIR/issue-5067.rs:9:8 | LL | ( $()* ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:11:8 | LL | ( $()+ ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:13:8 | LL | ( $()? ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:18:9 | LL | ( [$()*] ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:20:9 | LL | ( [$()+] ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:22:9 | LL | ( [$()?] ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:27:8 | LL | ( $($()* $(),* $(a)* $(a),* )* ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:29:8 | LL | ( $($()* $(),* $(a)* $(a),* )+ ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:31:8 | LL | ( $($()* $(),* $(a)* $(a),* )? ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:33:8 | LL | ( $($()? $(),* $(a)? $(a),* )* ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:35:8 | LL | ( $($()? $(),* $(a)? $(a),* )+ ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:37:8 | LL | ( $($()? $(),* $(a)? $(a),* )? ) => {}; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:47:12 | LL | ( $(a $()+)* ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:49:12 | LL | ( $(a $()*)+ ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:51:12 | LL | ( $(a $()+)? ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:53:12 | LL | ( $(a $()?)+ ) => {}; | ^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:60:18 | LL | (a $e1:expr $($(, a $e2:expr)*)*) => ([$e1 $($(, $e2)*)*]); | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-5067.rs:71:8 | LL | ( $()* ) => {}; | ^^ error: aborting due to 18 previous errors