library/core/tests/pin_macro.rs

   1 // edition:2021
   2 use core::{
   3     marker::PhantomPinned,
   4     mem::{drop as stuff, transmute},
   5     pin::{pin, Pin},
   6 };
   7
   8 #[test]
   9 fn basic() {
  10     let it: Pin<&mut PhantomPinned> = pin!(PhantomPinned);
  11     stuff(it);
  12 }
  13
  14 #[test]
  15 fn extension_works_through_block() {
  16     let it: Pin<&mut PhantomPinned> = { pin!(PhantomPinned) };
  17     stuff(it);
  18 }
  19
  20 #[test]
  21 fn extension_works_through_unsafe_block() {
  22     // "retro-type-inference" works as well.
  23     let it: Pin<&mut PhantomPinned> = unsafe { pin!(transmute(())) };
  24     stuff(it);
  25 }
  26
  27 #[test]
  28 fn unsize_coercion() {
  29     let slice: Pin<&mut [PhantomPinned]> = pin!([PhantomPinned; 2]);
  30     stuff(slice);
  31     let dyn_obj: Pin<&mut dyn Send> = pin!([PhantomPinned; 2]);
  32     stuff(dyn_obj);
  33 }