error: unsupported on types with type parameters
  --> tests/ui-msrv/union.rs:33:10
   |
33 | #[derive(IntoBytes)]
   |          ^^^^^^^^^
   |
   = note: this error originates in the derive macro `IntoBytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: must be #[repr(C)], #[repr(packed)], or #[repr(transparent)]
  --> tests/ui-msrv/union.rs:47:10
   |
47 | #[derive(IntoBytes)]
   |          ^^^^^^^^^
   |
   = note: this error originates in the derive macro `IntoBytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: must be #[repr(C)], #[repr(packed)], or #[repr(transparent)]
  --> tests/ui-msrv/union.rs:53:10
   |
53 | #[derive(IntoBytes)]
   |          ^^^^^^^^^
   |
   = note: this error originates in the derive macro `IntoBytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: cannot derive `Unaligned` on type with alignment greater than 1
  --> tests/ui-msrv/union.rs:64:11
   |
64 | #[repr(C, align(2))]
   |           ^^^^^

error: this conflicts with another representation hint
  --> tests/ui-msrv/union.rs:80:16
   |
80 | #[repr(packed, align(2))]
   |                ^^^^^

error: this conflicts with another representation hint
  --> tests/ui-msrv/union.rs:86:18
   |
86 | #[repr(align(1), align(2))]
   |                  ^^^^^

error: this conflicts with another representation hint
  --> tests/ui-msrv/union.rs:92:18
   |
92 | #[repr(align(2), align(4))]
   |                  ^^^^^

error: must have #[repr(C)], #[repr(transparent)], or #[repr(packed)] attribute in order to guarantee this type's alignment
  --> tests/ui-msrv/union.rs:97:10
   |
97 | #[derive(Unaligned)]
   |          ^^^^^^^^^
   |
   = note: this error originates in the derive macro `Unaligned` (in Nightly builds, run with -Z macro-backtrace for more info)

error: must have #[repr(C)], #[repr(transparent)], or #[repr(packed)] attribute in order to guarantee this type's alignment
   --> tests/ui-msrv/union.rs:103:10
    |
103 | #[derive(Unaligned)]
    |          ^^^^^^^^^
    |
    = note: this error originates in the derive macro `Unaligned` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: the trait bound `UnsafeCell<()>: zerocopy::Immutable` is not satisfied
  --> tests/ui-msrv/union.rs:24:10
   |
24 | #[derive(Immutable)]
   |          ^^^^^^^^^ the trait `zerocopy::Immutable` is not implemented for `UnsafeCell<()>`
   |
   = note: required because of the requirements on the impl of `zerocopy::Immutable` for `ManuallyDrop<UnsafeCell<()>>`
   = help: see issue #48214
   = note: this error originates in the derive macro `Immutable` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: the trait bound `(): PaddingFree<IntoBytes2, true>` is not satisfied
  --> tests/ui-msrv/union.rs:39:10
   |
39 | #[derive(IntoBytes)]
   |          ^^^^^^^^^ the trait `PaddingFree<IntoBytes2, true>` is not implemented for `()`
   |
   = help: the following implementations were found:
             <() as PaddingFree<T, false>>
   = help: see issue #48214
   = note: this error originates in the derive macro `IntoBytes` (in Nightly builds, run with -Z macro-backtrace for more info)