Conflicting representation hints have been used on a same item.
Erroneous code example:
#[repr(u32, u64)] // warning! enum Repr { A }
In most cases (if not all), using just one representation hint is more than enough. If you want to have a representation hint depending on the current architecture, use cfg_attr
. Example:
#[cfg_attr(linux, repr(u32))] #[cfg_attr(not(linux), repr(u64))] enum Repr { A }