error[E0606]: casting `&[u8; 3]` as `*const [u32; 3]` is invalid
  --> $DIR/cast-array-issue-138836.rs:4:13
   |
LL |     let c = b as *const [u32; 3];
   |             ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0606`.