Fix feature gate tests

Author: tiif

tests/ui/feature-gates/feature-gate-adt_const_params.rs

@@ -1,2 +1,6 @@
-struct Foo<const NAME: &'static str>; //~ ERROR `&'static str` is forbidden
+struct Bar(u8);
+
+struct Foo<const N: Bar>;
+//~^ ERROR: `Bar` is forbidden as the type of a const generic parameter
+
 fn main() {}

tests/ui/feature-gates/feature-gate-adt_const_params.stderr

@@ -1,18 +1,14 @@
-error: `&'static str` is forbidden as the type of a const generic parameter
-  --> $DIR/feature-gate-adt_const_params.rs:1:24
+error: `Bar` is forbidden as the type of a const generic parameter
+  --> $DIR/feature-gate-adt_const_params.rs:3:21
    |
-LL | struct Foo<const NAME: &'static str>;
-   |                        ^^^^^^^^^^^^
+LL | struct Foo<const N: Bar>;
+   |                     ^^^
    |
    = 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
 

tests/ui/feature-gates/feature-gate-unsized-const-params.rs

@@ -1,8 +1,6 @@
-#![feature(adt_const_params)]
-
-struct Bar(u8);
-
-struct Foo<const N: Bar>;
-//~^ ERROR: `Bar` must implement `ConstParamTy` to be used as the type of a const generic parameter
+struct Foo<const N: [u8]>;
+//~^ ERROR: `[u8]` is forbidden as the type of a const generic parameter
+//~| HELP: add `#![feature(adt_const_params)]` to the crate
+//~| HELP: add `#![feature(unsized_const_params)]` to the crate
 
 fn main() {}

tests/ui/feature-gates/feature-gate-unsized-const-params.stderr

@@ -1,15 +1,18 @@
-error[E0741]: `Bar` must implement `ConstParamTy` to be used as the type of a const generic parameter
-  --> $DIR/feature-gate-unsized-const-params.rs:5:21
+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: Bar>;
-   |                     ^^^
+LL | struct Foo<const N: [u8]>;
+   |                     ^^^^
    |
-help: add `#[derive(ConstParamTy, PartialEq, Eq)]` to the struct
+   = 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 - struct Bar(u8);
-LL + #[derive(ConstParamTy, PartialEq, Eq)]
+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
 
-For more information about this error, try `rustc --explain E0741`.