809c703a60
This is going to be fairly common. Using a custom procedural macro provides better error messages and automatically finds the right type. Note that this is different from the same-named macro in the derive_more crate. That one provides conversion from e.g. tuples to enums with tuple variants, not from integers to enums. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>