src/test/ui/issues/issue-21174.stderr

   1 error[E0512]: transmute called with types of different sizes
   2   --> $DIR/issue-21174.rs:17:30
   3    |
   4 LL |     let new: T::B = unsafe { std::mem::transmute(value) };
   5    |                              ^^^^^^^^^^^^^^^^^^^
   6    |
   7    = note: source type: <T as Trait<'a>>::A (size can vary because of <T as Trait>::A)
   8    = note: target type: <T as Trait<'a>>::B (size can vary because of <T as Trait>::B)
   9
  10 error: aborting due to previous error
  11
  12 For more information about this error, try `rustc --explain E0512`.