error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
  --> $DIR/base-layout-is-sized-ice-123078.rs:5:8
   |
LL |     a: [u8],
   |        ^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `[u8]`
   = note: only the last field of a struct may have a dynamically sized type
   = help: change the field's type to have a statically known size
help: borrowed types always have a statically known size
   |
LL |     a: &[u8],
   |        +
help: the `Box` type always has a statically known size and allocates its contents in the heap
   |
LL |     a: Box<[u8]>,
   |        ++++    +

error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
  --> $DIR/base-layout-is-sized-ice-123078.rs:10:23
   |
LL | const C: S = unsafe { std::mem::transmute(()) };
   |                       ^^^^^^^^^^^^^^^^^^^
   |
   = note: source type: `()` (0 bits)
   = note: target type: `S` (size can vary because of [u8])

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0512.
For more information about an error, try `rustc --explain E0277`.