standback 0.2.11

New standard library, old compiler.
Documentation 
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use crate::marker::Unpin;
use core::{
    fmt,
    ops::{Deref, DerefMut},
};

#[repr(transparent)]
#[derive(Copy, Clone)]
pub struct Pin<P> {
    pointer: P,
}

impl<P: Deref<Target = T>, T: Unpin> Pin<P> {
    #[inline(always)]
    pub fn new(pointer: P) -> Pin<P> {
        unsafe { Pin::new_unchecked(pointer) }
    }
}

impl<P: Deref> Pin<P> {
    #[inline(always)]
    pub unsafe fn new_unchecked(pointer: P) -> Pin<P> {
        Pin { pointer }
    }

    #[inline(always)]
    pub fn as_ref(&self) -> Pin<&P::Target> {
        unsafe { Pin::new_unchecked(&*self.pointer) }
    }
}

impl<P: DerefMut> Pin<P> {
    #[inline(always)]
    pub fn as_mut(&mut self) -> Pin<&mut P::Target> {
        unsafe { Pin::new_unchecked(&mut *self.pointer) }
    }

    #[inline(always)]
    pub fn set(&mut self, value: P::Target)
    where
        P::Target: Sized,
    {
        *(self.pointer) = value;
    }
}

impl<'a, T: ?Sized> Pin<&'a T> {
    pub unsafe fn map_unchecked<U, F>(self, func: F) -> Pin<&'a U>
    where
        U: ?Sized,
        F: FnOnce(&T) -> &U,
    {
        let pointer = &*self.pointer;
        let new_pointer = func(pointer);
        Pin::new_unchecked(new_pointer)
    }

    #[inline(always)]
    pub fn get_ref(self) -> &'a T {
        self.pointer
    }
}

impl<'a, T: ?Sized> Pin<&'a mut T> {
    #[inline(always)]
    pub fn into_ref(self) -> Pin<&'a T> {
        Pin {
            pointer: self.pointer,
        }
    }

    #[inline(always)]
    pub fn get_mut(self) -> &'a mut T
    where
        T: Unpin,
    {
        self.pointer
    }

    #[inline(always)]
    pub unsafe fn get_unchecked_mut(self) -> &'a mut T {
        self.pointer
    }

    pub unsafe fn map_unchecked_mut<U, F>(self, func: F) -> Pin<&'a mut U>
    where
        U: ?Sized,
        F: FnOnce(&mut T) -> &mut U,
    {
        let pointer = Pin::get_unchecked_mut(self);
        let new_pointer = func(pointer);
        Pin::new_unchecked(new_pointer)
    }
}

impl<P: Deref> Deref for Pin<P> {
    type Target = P::Target;

    fn deref(&self) -> &P::Target {
        Pin::get_ref(Pin::as_ref(self))
    }
}

impl<P: DerefMut<Target = T>, T: Unpin> DerefMut for Pin<P> {
    fn deref_mut(&mut self) -> &mut P::Target {
        Pin::get_mut(Pin::as_mut(self))
    }
}

impl<P: fmt::Debug> fmt::Debug for Pin<P> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Debug::fmt(&self.pointer, f)
    }
}

impl<P: fmt::Display> fmt::Display for Pin<P> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Display::fmt(&self.pointer, f)
    }
}

impl<P: fmt::Pointer> fmt::Pointer for Pin<P> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Pointer::fmt(&self.pointer, f)
    }
}