error[E0512]: transmute called with types of different sizes
  --> $DIR/packed-struct-generic-transmute.rs:34:38
   |
LL |         let oof: Oof<[u8; 5], i32> = mem::transmute(foo);
   |                                      ^^^^^^^^^^^^^^
   |
   = note: source type: Foo<[u8; 5], i32> (72 bits)
   = note: target type: Oof<[u8; 5], i32> (96 bits)

error: aborting due to previous error

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