error: expected `*` or `+` | |
--> $DIR/macro-at-most-once-rep-2015-ques-rep.rs:6:10 | |
| | |
LL | ($(a)?) => {} | |
| ^ | |
| | |
= note: `?` is not a macro repetition operator in the 2015 edition, but is accepted in the 2018 edition | |
error: expected `*` or `+` | |
--> $DIR/macro-at-most-once-rep-2015-ques-rep.rs:10:11 | |
| | |
LL | ($(a),?) => {} | |
| ^ | |
| | |
= note: `?` is not a macro repetition operator in the 2015 edition, but is accepted in the 2018 edition | |
error: aborting due to 2 previous errors | |