src/test/ui/consts/issue-79690.rs

   1 // ignore-32bit
   2 // This test gives a different error on 32-bit architectures.
   3 // stderr-per-bitwidth
   4
   5 union Transmute<T: Copy, U: Copy> {
   6     t: T,
   7     u: U,
   8 }
   9 trait Bar {
  10     fn bar(&self) -> u32;
  11 }
  12 struct Foo {
  13     foo: u32,
  14     bar: bool,
  15 }
  16 impl Bar for Foo {
  17     fn bar(&self) -> u32 {
  18         self.foo
  19     }
  20 }
  21 #[derive(Copy, Clone)]
  22 struct Fat<'a>(&'a Foo, &'static VTable);
  23 struct VTable {
  24     size: Foo,
  25 }
  26 const FOO: &dyn Bar = &Foo {
  27     foo: 128,
  28     bar: false,
  29 };
  30 const G: Fat = unsafe { Transmute { t: FOO }.u };
  31 //~^ ERROR it is undefined behavior to use this value
  32
  33 fn main() {}