error: expected parameter name, found `)` --> $DIR/attr-without-param.rs:3:17 | LL | fn f(#[attr]) {} | ^ expected parameter name error: expected parameter name, found `)` --> $DIR/attr-without-param.rs:8:17 | LL | fn f(#[attr]) {} | ^ expected parameter name error: expected argument name, found `)` --> $DIR/attr-without-param.rs:13:17 | LL | fn f(#[attr]); | ^ expected argument name error: aborting due to 3 previous errors