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