error: `[usize; 0]` is forbidden as the type of a const generic parameter
  --> $DIR/issue-68615-array.rs:6:21
   |
LL | struct Foo<const V: [usize; 0] > {}
   |                     ^^^^^^^^^^
   |
   = 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

error: aborting due to 1 previous error