error: `?` may only modify trait bounds, not lifetime bounds --> $DIR/issue-68890.rs:1:11 | LL | enum e{A((?'a a+?+l))} | ^ error: expected one of `)`, `+`, or `,`, found `a` --> $DIR/issue-68890.rs:1:15 | LL | enum e{A((?'a a+?+l))} | ^ expected one of `)`, `+`, or `,` error: expected item, found `)` --> $DIR/issue-68890.rs:1:21 | LL | enum e{A((?'a a+?+l))} | ^ expected item error: aborting due to 3 previous errors