1 error: expected `*` or `+`
2 --> $DIR/macro-at-most-once-rep-2015-ques-rep.rs:16:10
4 LL | ($(a)?) => {} //~ERROR expected `*` or `+`
7 = note: `?` is not a macro repetition operator
9 error: expected `*` or `+`
10 --> $DIR/macro-at-most-once-rep-2015-ques-rep.rs:20:11
12 LL | ($(a),?) => {} //~ERROR expected `*` or `+`
15 = note: `?` is not a macro repetition operator
17 error: aborting due to 2 previous errors