error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
  --> $DIR/ice-zst-as-discr-145786.rs:12:25
   |
LL |     let _: A = unsafe { std::mem::transmute(()) };
   |                         ^^^^^^^^^^^^^^^^^^^
   |
   = note: source type: `()` (0 bits)
   = note: target type: `A` (8 bits)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0512`.