src/test/ui/box/leak-alloc.rs

   1 #![feature(allocator_api)]
   2
   3 use std::alloc::{AllocError, Allocator, Layout, System};
   4 use std::ptr::NonNull;
   5
   6 use std::boxed::Box;
   7
   8 struct Alloc {}
   9
  10 unsafe impl Allocator for Alloc {
  11     fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
  12         System.allocate(layout)
  13     }
  14
  15     unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
  16         System.deallocate(ptr, layout)
  17     }
  18 }
  19
  20 fn use_value(_: u32) {}
  21
  22 fn main() {
  23     let alloc = Alloc {};
  24     let boxed = Box::new_in(10, alloc.by_ref());
  25     let theref = Box::leak(boxed);
  26     drop(alloc);
  27     //~^ ERROR cannot move out of `alloc` because it is borrowed
  28     use_value(*theref)
  29 }