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error[E0053]: method `seek` has an incompatible type for trait
   --> src/scheme.rs:296:5
    |
296 |     fn seek(&mut self, fd: usize, pos: usize, whence: usize) -> Result<usize> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `isize`, found `usize`
    |
    = note: expected fn pointer `fn(&mut scheme::Scheme, usize, isize, usize) -> std::result::Result<isize, syscall::error::Error>`
               found fn pointer `fn(&mut scheme::Scheme, usize, usize, usize) -> std::result::Result<usize, syscall::error::Error>`

The signature of the seek() method has been changed by this MR: syscall!45 (merged).