tests/ui/deriving/deriving-with-repr-packed.rs

   1 // run-pass
   2 // check that derive on a packed struct does not call field
   3 // methods with a misaligned field.
   4
   5 use std::mem;
   6
   7 #[derive(Copy, Clone)]
   8 struct Aligned(usize);
   9
  10 #[inline(never)]
  11 fn check_align(ptr: *const Aligned) {
  12     assert_eq!(ptr as usize % mem::align_of::<Aligned>(),
  13                0);
  14 }
  15
  16 impl PartialEq for Aligned {
  17     fn eq(&self, other: &Self) -> bool {
  18         check_align(self);
  19         check_align(other);
  20         self.0 == other.0
  21     }
  22 }
  23
  24 #[repr(packed)]
  25 #[derive(Copy, Clone, PartialEq)]
  26 struct Packed(Aligned, Aligned);
  27
  28 #[derive(PartialEq)]
  29 #[repr(C)]
  30 struct Dealigned<T>(u8, T);
  31
  32 fn main() {
  33     let d1 = Dealigned(0, Packed(Aligned(1), Aligned(2)));
  34     let ck = d1 == d1;
  35     assert!(ck);
  36 }