fn enum_layout(
enum_ty: &Ty,
structs: &[MirStructDecl],
enums: &[MirEnumDecl],
) -> Result<EnumLayout, LowerError>fn enum_layout(
enum_ty: &Ty,
structs: &[MirStructDecl],
enums: &[MirEnumDecl],
) -> Result<EnumLayout, LowerError>