Error code E0634

A type has conflicting packed representation hints.

Erroneous code examples:

#![allow(unused)] fn main() { #[repr(packed, packed(2))] // error! struct Company(i32); #[repr(packed(2))] // error! #[repr(packed)] struct Company(i32); }

You cannot use conflicting packed hints on a same type. If you want to pack a type to a given size, you should provide a size to packed:

#![allow(unused)] fn main() { #[repr(packed)] // ok! struct Company(i32); }