explicit alignment assertion

Author: rustopian

sdk/pinocchio/src/sysvars/slot_hashes/test_std.rs

@@ -1,10 +1,7 @@
 //! Tests that rely on the `std` feature (host-only helpers, alloc, etc.).
 
 use super::*;
-use crate::{
-    account_info::{Account, AccountInfo},
-    pubkey::Pubkey,
-};
+use crate::account_info::{Account, AccountInfo};
 use core::ptr;
 extern crate std;
 use super::test_utils::*;

sdk/pinocchio/src/sysvars/slot_hashes/test_utils.rs

@@ -124,6 +124,10 @@ pub unsafe fn make_account_info(
     let total = hdr_size + data.len();
     let words = (total + 7) / 8;
     let mut backing: Vec<u64> = std::vec![0u64; words];
+    assert!(
+        mem::align_of::<u64>() >= mem::align_of::<AccountLayout>(),
+        "`backing` should be properly aligned to store an `AccountLayout` instance"
+    );
 
     let hdr_ptr = backing.as_mut_ptr() as *mut AccountLayout;
     ptr::write(