error: repetition matches empty token tree --> $DIR/issue-57597.rs:8:7 | LL | ($($($i:ident)?)+) => {}; | ^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:13:7 | LL | ($($($i:ident)?)*) => {}; | ^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:18:7 | LL | ($($($i:ident)?)?) => {}; | ^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:23:7 | LL | ($($($($i:ident)?)?)?) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:28:7 | LL | ($($($($i:ident)*)?)?) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:33:7 | LL | ($($($($i:ident)?)*)?) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:38:7 | LL | ($($($($i:ident)?)?)*) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:43:7 | LL | ($($($($i:ident)*)*)?) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:48:7 | LL | ($($($($i:ident)?)*)*) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:53:7 | LL | ($($($($i:ident)?)*)+) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:58:7 | LL | ($($($($i:ident)+)?)*) => {}; | ^^^^^^^^^^^^^^^^^^ error: repetition matches empty token tree --> $DIR/issue-57597.rs:63:7 | LL | ($($($($i:ident)+)*)?) => {}; | ^^^^^^^^^^^^^^^^^^ error: aborting due to 12 previous errors