warning: unused variable: `io_vec`
  --> src/sys.rs:90:13
   |
90 |     let mut io_vec = libc::iovec {
   |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_io_vec`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `cmsg_buffer`
  --> src/sys.rs:95:13
   |
95 |     let mut cmsg_buffer = vec![0u8; cmsg_buffer_len as usize];
   |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_cmsg_buffer`

warning: variable does not need to be mutable
  --> src/sys.rs:90:9
   |
90 |     let mut io_vec = libc::iovec {
   |         ----^^^^^^
   |         |
   |         help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
  --> src/sys.rs:95:9
   |
95 |     let mut cmsg_buffer = vec![0u8; cmsg_buffer_len as usize];
   |         ----^^^^^^^^^^^
   |         |
   |         help: remove this `mut`

error[E0381]: used binding `message` isn't initialized
   --> src/sys.rs:136:56
    |
96  |     let mut message: libc::msghdr;
    |         ----------- binding declared here but left uninitialized
...
136 |             result = libc::recvmsg(socket.as_raw_fd(), &mut message, 0);
    |                                                        ^^^^^^^^^^^^ `message` used here but it isn't initialized
    |
help: consider assigning a value
    |
96  |     let mut message: libc::msghdr = /* value */;
    |                                   +++++++++++++

Some errors have detailed explanations: E0308, E0381, E0425.
For more information about an error, try `rustc --explain E0308`.
warning: `fuser` (lib) generated 6 warnings
error: could not compile `fuser` (lib) due to 3 previous errors; 6 warnings emitted
warning: build failed, waiting for other jobs to finish...
warning: `fuser` (lib test) generated 6 warnings (6 duplicates)
error: could not compile `fuser` (lib test) due to 3 previous errors; 6 warnings emitted

Exit status: 101