1 error: this file contains an unclosed delimiter
2 --> $DIR/issue-84148-2.rs:4:16
9 error: expected parameter name, found `?`
10 --> $DIR/issue-84148-2.rs:4:14
13 | ^ expected parameter name
15 error: expected one of `(`, `)`, `+`, `,`, `::`, or `<`, found `?`
16 --> $DIR/issue-84148-2.rs:4:14
21 | expected one of `(`, `)`, `+`, `,`, `::`, or `<`
24 error: expected one of `->`, `;`, `where`, or `{`, found `<eof>`
25 --> $DIR/issue-84148-2.rs:4:16
28 | ^ expected one of `->`, `;`, `where`, or `{`
30 error: aborting due to 4 previous errors