error: 3, 4 or 5 comma-separated args expected.

         = help: Use `#[unit(<ident>, "<symbol>", <si_prefix>, <scale>, "<doc>")]`
                or  `#[unit(<ident>, "<symbol>", <si_prefix>, <scale>)]`
       or  `#[unit(<ident>, "<symbol>", <scale>, "<doc>")]`
       or  `#[unit(<ident>, "<symbol>", <scale>)]`.

  --> tests/ui/wrong_number_of_args_unit.rs:15:1
   |
15 | #[unit(B, "b", 0.4, NONE, "bla")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^