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error[E0277]: the trait bound `T: KnownLayout` is not satisfied
  --> tests/ui-msrv/mid_compile_pass.rs:59:26
   |
59 | fn test_kl13<T>(t: T) -> impl KnownLayout {
   |                          ^^^^^^^^^^^^^^^^ the trait `KnownLayout` is not implemented for `T`
   |
note: required because of the requirements on the impl of `KnownLayout` for `KL13<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:55:10
   |
55 | #[derive(KnownLayout)]
   |          ^^^^^^^^^^^
   = note: this error originates in the derive macro `KnownLayout` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider restricting type parameter `T`
   |
59 | fn test_kl13<T: zerocopy::KnownLayout>(t: T) -> impl KnownLayout {
   |               +++++++++++++++++++++++

error[E0277]: the size for values of type `T` cannot be known at compilation time
  --> tests/ui-msrv/mid_compile_pass.rs:31:15
   |
30 | fn test_kl04<T: ?Sized>(kl: &KL04<T>) {
   |              - this type parameter needs to be `std::marker::Sized`
31 |     assert_kl(kl);
   |     --------- ^^ doesn't have a size known at compile-time
   |     |
   |     required by a bound introduced by this call
   |
note: required because it appears within the type `KL04<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:28:8
   |
28 | struct KL04<T: ?Sized>(u8, T);
   |        ^^^^
note: required because of the requirements on the impl of `KnownLayout` for `KL04<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:27:10
   |
27 | #[derive(KnownLayout)]
   |          ^^^^^^^^^^^
note: required by a bound in `assert_kl`
  --> tests/ui-msrv/mid_compile_pass.rs:23:26
   |
23 | fn assert_kl<T: ?Sized + KnownLayout>(_: &T) {}
   |                          ^^^^^^^^^^^ required by this bound in `assert_kl`
   = note: this error originates in the derive macro `KnownLayout` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider removing the `?Sized` bound to make the type parameter `Sized`
   |
30 - fn test_kl04<T: ?Sized>(kl: &KL04<T>) {
30 + fn test_kl04<T>(kl: &KL04<T>) {
   |

error[E0277]: the size for values of type `T` cannot be known at compilation time
  --> tests/ui-msrv/mid_compile_pass.rs:40:15
   |
39 | fn test_kl06<T: ?Sized + KnownLayout>(kl: &KL06<T>) {
   |              - this type parameter needs to be `std::marker::Sized`
40 |     assert_kl(kl);
   |     --------- ^^ doesn't have a size known at compile-time
   |     |
   |     required by a bound introduced by this call
   |
note: required because it appears within the type `KL06<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:37:8
   |
37 | struct KL06<T: ?Sized + KnownLayout>(u8, T);
   |        ^^^^
note: required because of the requirements on the impl of `KnownLayout` for `KL06<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:36:10
   |
36 | #[derive(KnownLayout)]
   |          ^^^^^^^^^^^
note: required by a bound in `assert_kl`
  --> tests/ui-msrv/mid_compile_pass.rs:23:26
   |
23 | fn assert_kl<T: ?Sized + KnownLayout>(_: &T) {}
   |                          ^^^^^^^^^^^ required by this bound in `assert_kl`
   = note: this error originates in the derive macro `KnownLayout` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider removing the `?Sized` bound to make the type parameter `Sized`
   |
39 - fn test_kl06<T: ?Sized + KnownLayout>(kl: &KL06<T>) {
39 + fn test_kl06<T: KnownLayout>(kl: &KL06<T>) {
   |

error[E0277]: the trait bound `T: KnownLayout` is not satisfied
  --> tests/ui-msrv/mid_compile_pass.rs:50:15
   |
50 |     assert_kl(kl)
   |     --------- ^^ the trait `KnownLayout` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required because of the requirements on the impl of `KnownLayout` for `KL12<T>`
  --> tests/ui-msrv/mid_compile_pass.rs:45:10
   |
45 | #[derive(KnownLayout)]
   |          ^^^^^^^^^^^
note: required by a bound in `assert_kl`
  --> tests/ui-msrv/mid_compile_pass.rs:23:26
   |
23 | fn assert_kl<T: ?Sized + KnownLayout>(_: &T) {}
   |                          ^^^^^^^^^^^ required by this bound in `assert_kl`
   = note: this error originates in the derive macro `KnownLayout` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider further restricting this bound
   |
49 | fn test_kl12<T: ?Sized + zerocopy::KnownLayout>(kl: &KL12<T>) {
   |                        +++++++++++++++++++++++