Array Transmutery @WaffleLapkin @BoxyUwU

pub unsafe const fn my_zeroed<T>() -> T {
    assert!(std::mem::size_of::<T>() <= 256);

    unsafe {
        std::mem::transmute_copy(&[0u8; 256])
    }
}

fn main() {
    unsafe {
        my_zeroed::<[*mut u32; 64]>();
    }
}
Solution 
error: expected one of `extern` or `fn`, found keyword `const`
 --> examples/misc_1.rs:1:12
  |
1 | pub unsafe const fn my_zeroed<T>() -> T {
  |     -------^^^^^
  |     |      |
  |     |      expected one of `extern` or `fn`
  |     help: `const` must come before `unsafe`: `const unsafe`
  |
  = note: keyword order for functions declaration is `pub`, `default`, `const`, `async`, `unsafe`, `extern`

error: could not compile `code` (example "misc_1") due to 1 previous error

As the error says, there is a given order function qualifiers must go in.

Careful readers may also have noticed that the size of [*mut u32; 64] is not necessarily equal to [u8; 256]. On 64bit platforms the array of pointers would be 512 bytes large, 8 bytes * 64 elements = 256 bytes. While this is a logical error and would result in a panic at runtime, the code can never be executed due to the compilation error.