src/test/ui/pin-macro/lifetime_errors_on_promotion_misusage.rs

   1 // edition:2018
   2 #![feature(pin_macro)]
   3
   4 use core::{
   5     convert::identity,
   6     marker::PhantomPinned,
   7     mem::drop as stuff,
   8     pin::pin,
   9 };
  10
  11 fn function_call_stops_borrow_extension() {
  12     let phantom_pinned = identity(pin!(PhantomPinned));
  13     //~^ ERROR temporary value dropped while borrowed
  14     stuff(phantom_pinned)
  15 }
  16
  17 fn promotion_only_works_for_the_innermost_block() {
  18     let phantom_pinned = {
  19         let phantom_pinned = pin!(PhantomPinned);
  20         //~^ ERROR temporary value dropped while borrowed
  21         phantom_pinned
  22     };
  23     stuff(phantom_pinned)
  24 }
  25
  26 fn main() {
  27     function_call_stops_borrow_extension();
  28     promotion_only_works_for_the_innermost_block();
  29 }