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use std::mem::MaybeUninit;
use std::ops::Deref;
pub unsafe trait Array {
/// The array’s element type
type Item;
#[doc(hidden)]
/// The smallest index type that indexes the array.
type Index: Index;
#[doc(hidden)]
fn as_ptr(&self) -> *const Self::Item;
#[doc(hidden)]
fn as_mut_ptr(&mut self) -> *mut Self::Item;
#[doc(hidden)]
fn capacity() -> usize;
}
pub trait Index : PartialEq + Copy {
fn to_usize(self) -> usize;
fn from(i: usize) -> Self;
}
impl Index for usize {
fn to_usize(self) -> usize { self }
fn from(val: usize) -> Self {
val
}
}
unsafe impl<T> Array for [T; 1] {
type Item = T;
type Index = usize;
fn as_ptr(&self) -> *const T { self as *const _ as *const _ }
fn as_mut_ptr(&mut self) -> *mut T { self as *mut _ as *mut _}
fn capacity() -> usize { 1 }
}
impl<A: Array> Deref for ArrayVec<A> {
type Target = [A::Item];
#[inline]
fn deref(&self) -> &[A::Item] {
panic!()
}
}
pub struct ArrayVec<A: Array> {
xs: MaybeUninit<A>,
len: usize,
}
impl<A: Array> ArrayVec<A> {
pub fn new() -> ArrayVec<A> {
panic!()
}
}
fn main() {
let mut buffer = ArrayVec::new();
let x = buffer.last().unwrap().0.clone();
//~^ ERROR type annotations needed
//~| ERROR no field `0` on type `&_`
buffer.reverse();
}
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