|  | error: `[u8]` is forbidden as the type of a const generic parameter | 
|  | --> $DIR/feature-gate-unsized-const-params.rs:1:21 | 
|  | | | 
|  | LL | struct Foo<const N: [u8]>; | 
|  | |                     ^^^^ | 
|  | | | 
|  | = 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)] | 
|  | | | 
|  | help: add `#![feature(unsized_const_params)]` to the crate attributes to enable references to implement the `ConstParamTy` trait | 
|  | | | 
|  | LL + #![feature(unsized_const_params)] | 
|  | | | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  |