error[E0308]: mismatched types
 --> tests/ui/invalid_offset_type.rs:6:19
  |
6 |     #[br(offset = a)]
  |                   ^
  |                   |
  |                   expected `u64`, found `u8`
  |                   arguments to this method are incorrect
  |
note: method defined here
 --> src/file_ptr.rs
  |
  |     pub offset: u64,
  |         ^^^^^^
help: you can convert a `u8` to a `u64`
    |
6   |     #[br(offset = a.into())]
    |                    +++++++