error: `[usize; 0]` is forbidden as the type of a const generic parameter --> $DIR/issue-68615-array.rs:6:21 | LL | struct Foo {} | ^^^^^^^^^^ | = note: the only supported types are integers, `bool` and `char` = help: more complex types are supported with `#![feature(adt_const_params)]` error: aborting due to previous error