Uses std::mem::transmute and std::ptr::write in unsafe code in append_vec.rs

Author: Lichtso

runtime/src/append_vec.rs

@@ -706,7 +706,7 @@ pub mod tests {
         fn set_data_len_unsafe(&self, new_data_len: u64) {
             // UNSAFE: cast away & (= const ref) to &mut to force to mutate append-only (=read-only) AppendVec
             unsafe {
-                *(&self.meta.data_len as *const u64 as *mut u64) = new_data_len;
+                std::ptr::write(std::mem::transmute<*const u64, *mut u64>(&self.meta.data_len), new_data_len);
             }
         }
 
@@ -721,7 +721,7 @@ pub mod tests {
         fn set_executable_as_byte(&self, new_executable_byte: u8) {
             // UNSAFE: Force to interpret mmap-backed &bool as &u8 to write some crafted value;
             unsafe {
-                *(&self.account_meta.executable as *const bool as *mut u8) = new_executable_byte;
+                std::ptr::write(std::mem::transmute<*const bool, *mut u8>(&self.account_meta.executable), new_executable_byte);
             }
         }
     }