src/test/ui/feature-gates/feature-gate-unsafe_pin_internals.rs

   1 // edition:2018
   2 #![forbid(incomplete_features, unsafe_code)]
   3 #![feature(unsafe_pin_internals)]
   4 //~^ ERROR the feature `unsafe_pin_internals` is incomplete and may not be safe to use
   5
   6 use core::{marker::PhantomPinned, pin::Pin};
   7
   8 /// The `unsafe_pin_internals` is indeed unsound.
   9 fn non_unsafe_pin_new_unchecked<T>(pointer: &mut T) -> Pin<&mut T> {
  10     Pin { pointer }
  11 }
  12
  13 fn main() {
  14     let mut self_referential = PhantomPinned;
  15     let _: Pin<&mut PhantomPinned> = non_unsafe_pin_new_unchecked(&mut self_referential);
  16     core::mem::forget(self_referential); // move and disable drop glue!
  17 }