memmapix 0.8.0

A pure Rust library for cross-platform memory mapped IO, which replaces libc with rustix
Documentation 
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use std::{fs::File, io};

// A stable alternative to https://doc.rust-lang.org/stable/std/primitive.never.html
enum Never {}

pub struct MmapInner {
  never: Never,
}

impl MmapInner {
  fn new() -> io::Result<MmapInner> {
    Err(io::ErrorKind::Unsupported.into())
  }

  pub fn map(_: usize, _: &File, _: u64, _: bool, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn map_exec(_: usize, _: &File, _: u64, _: bool, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn map_mut(_: usize, _: &File, _: u64, _: bool, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn map_copy(_: usize, _: &File, _: u64, _: bool, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn map_copy_read_only(_: usize, _: &File, _: u64, _: bool, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn map_anon(_: usize, _: bool, _: bool, _: Option<u8>, _: bool) -> io::Result<MmapInner> {
    MmapInner::new()
  }

  pub fn flush(&self, _: usize, _: usize) -> io::Result<()> {
    match self.never {}
  }

  pub fn flush_async(&self, _: usize, _: usize) -> io::Result<()> {
    match self.never {}
  }

  pub fn make_read_only(&mut self) -> io::Result<()> {
    match self.never {}
  }

  pub fn make_exec(&mut self) -> io::Result<()> {
    match self.never {}
  }

  pub fn make_mut(&mut self) -> io::Result<()> {
    match self.never {}
  }

  #[inline]
  pub fn ptr(&self) -> *const u8 {
    match self.never {}
  }

  #[inline]
  pub fn mut_ptr(&mut self) -> *mut u8 {
    match self.never {}
  }

  #[inline]
  pub fn len(&self) -> usize {
    match self.never {}
  }
}

pub fn file_len(file: &File) -> io::Result<u64> {
  Ok(file.metadata()?.len())
}