message: Try fixing test on i686-unknown-linux-gnu
diff: extern crate libc;
  +use std::convert::TryInto;
  use std::env::temp_dir;
  use std::fs::{File, remove_file};
  use std::io::Write;
  @@ -25,7 +26,7 @@ fn main() {
  libc::posix_fadvise(
  file.as_raw_fd(),
  0,
  - bytes.len() as i64,
  + bytes.len().try_into().unwrap(),
  libc::POSIX_FADV_DONTNEED,
  )
  };
  