Conflicting representation hints have been used on a same item.
Erroneous code example:
#[repr(u32, u64)]
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 }