error: `[u8; 1 + 2]` is forbidden as the type of a const generic parameter
  --> $DIR/issue-74101.rs:6:18
   |
LL | fn test<const N: [u8; 1 + 2]>() {}
   |                  ^^^^^^^^^^^
   |
   = note: the only supported types are integers, `bool` and `char`
help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
   |
LL + #![feature(adt_const_params)]
   |

error: `[u8; 1 + 2]` is forbidden as the type of a const generic parameter
  --> $DIR/issue-74101.rs:9:21
   |
LL | struct Foo<const N: [u8; 1 + 2]>;
   |                     ^^^^^^^^^^^
   |
   = note: the only supported types are integers, `bool` and `char`
help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types
   |
LL + #![feature(adt_const_params)]
   |

error: aborting due to 2 previous errors