error: FromBytes only supported on repr(u8) enum with 256 variants
   --> tests/ui-msrv/enum_from_bytes_u8_too_few.rs:15:1
    |
15  | / #[repr(u8)]
16  | | enum Foo {
17  | |     Variant0,
18  | |     Variant1,
...   |
271 | |     Variant254,
272 | | }
    | |_^