src/test/ui/mir/ssa-analysis-regression-50041.rs

   1 // build-pass
   2 // compile-flags: -Z mir-opt-level=4
   3
   4 #![crate_type="lib"]
   5 #![feature(lang_items)]
   6 #![no_std]
   7
   8 #[lang = "owned_box"]
   9 pub struct Box<T: ?Sized>(*mut T);
  10
  11 impl<T: ?Sized> Drop for Box<T> {
  12     fn drop(&mut self) {
  13     }
  14 }
  15
  16 #[lang = "box_free"]
  17 #[inline(always)]
  18 unsafe fn box_free<T: ?Sized>(ptr: *mut T) {
  19     dealloc(ptr)
  20 }
  21
  22 #[inline(never)]
  23 fn dealloc<T: ?Sized>(_: *mut T) {
  24 }
  25
  26 pub struct Foo<T>(T);
  27
  28 pub fn foo(a: Option<Box<Foo<usize>>>) -> usize {
  29     let f = match a {
  30         None => Foo(0),
  31         Some(vec) => *vec,
  32     };
  33     f.0
  34 }