error: unrecognized representation hint
  --> tests/ui-msrv/enum.rs:15:8
   |
15 | #[repr("foo")]
   |        ^^^^^

error: unrecognized representation hint
  --> tests/ui-msrv/enum.rs:21:8
   |
21 | #[repr(foo)]
   |        ^^^

error: unsupported representation for deriving FromBytes, AsBytes, or Unaligned on an enum
  --> tests/ui-msrv/enum.rs:27:8
   |
27 | #[repr(transparent)]
   |        ^^^^^^^^^^^

error: conflicting representation hints
  --> tests/ui-msrv/enum.rs:33:1
   |
33 | #[repr(u8, u16)]
   | ^

error: must have a non-align #[repr(...)] attribute in order to guarantee this type's memory layout
  --> tests/ui-msrv/enum.rs:38:10
   |
38 | #[derive(FromBytes)]
   |          ^^^^^^^^^
   |
   = note: this error originates in the derive macro `FromBytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:48:8
   |
48 | #[repr(C)]
   |        ^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:54:8
   |
54 | #[repr(usize)]
   |        ^^^^^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:60:8
   |
60 | #[repr(isize)]
   |        ^^^^^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:66:8
   |
66 | #[repr(u32)]
   |        ^^^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:72:8
   |
72 | #[repr(i32)]
   |        ^^^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:78:8
   |
78 | #[repr(u64)]
   |        ^^^

error: FromBytes requires repr of "u8", "u16", "i8", or "i16"
  --> tests/ui-msrv/enum.rs:84:8
   |
84 | #[repr(i64)]
   |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
  --> tests/ui-msrv/enum.rs:94:8
   |
94 | #[repr(C)]
   |        ^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:100:8
    |
100 | #[repr(u16)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:106:8
    |
106 | #[repr(i16)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:112:8
    |
112 | #[repr(u32)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:118:8
    |
118 | #[repr(i32)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:124:8
    |
124 | #[repr(u64)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:130:8
    |
130 | #[repr(i64)]
    |        ^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:136:8
    |
136 | #[repr(usize)]
    |        ^^^^^

error: Unaligned requires repr of "u8" or "i8", and no alignment (i.e., repr(align(N > 1)))
   --> tests/ui-msrv/enum.rs:142:8
    |
142 | #[repr(isize)]
    |        ^^^^^

error: cannot derive Unaligned with repr(align(N > 1))
   --> tests/ui-msrv/enum.rs:148:12
    |
148 | #[repr(u8, align(2))]
    |            ^^^^^^^^

error: cannot derive Unaligned with repr(align(N > 1))
   --> tests/ui-msrv/enum.rs:154:12
    |
154 | #[repr(i8, align(2))]
    |            ^^^^^^^^

error: cannot derive Unaligned with repr(align(N > 1))
   --> tests/ui-msrv/enum.rs:160:18
    |
160 | #[repr(align(1), align(2))]
    |                  ^^^^^^^^

error: cannot derive Unaligned with repr(align(N > 1))
   --> tests/ui-msrv/enum.rs:166:8
    |
166 | #[repr(align(2), align(4))]
    |        ^^^^^^^^

error[E0565]: meta item in `repr` must be an identifier
  --> tests/ui-msrv/enum.rs:15:8
   |
15 | #[repr("foo")]
   |        ^^^^^

error[E0552]: unrecognized representation hint
  --> tests/ui-msrv/enum.rs:21:8
   |
21 | #[repr(foo)]
   |        ^^^

error[E0566]: conflicting representation hints
  --> tests/ui-msrv/enum.rs:33:8
   |
33 | #[repr(u8, u16)]
   |        ^^  ^^^
   |
   = note: `#[deny(conflicting_repr_hints)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/68585>