fix interior_mutable_const err

Author: DevinR528

tests/ui/declare_interior_mutable_const.stderr

@@ -45,19 +45,25 @@ error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:44:5
    |
 LL |     const INPUT: T;
-   |     ^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^-^
+   |                  |
+   |                  consider requiring `T` to be `Copy`
 
 error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:47:5
    |
 LL |     const ASSOC: Self::NonCopyType;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^-----------------^
+   |                  |
+   |                  consider requiring `<Self as Trait<T>>::NonCopyType` to be `Copy`
 
 error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:51:5
    |
 LL |     const AN_INPUT: T = Self::INPUT;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^-^^^^^^^^^^^^^^^
+   |                     |
+   |                     consider requiring `T` to be `Copy`
 
 error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:16:9
@@ -74,7 +80,9 @@ error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:60:5
    |
 LL |     const SELF_2: Self;
-   |     ^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^----^
+   |                   |
+   |                   consider requiring `Self` to be `Copy`
 
 error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:81:5
@@ -86,13 +94,17 @@ error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:84:5
    |
 LL |     const U_SELF: U = U::SELF_2;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^-^^^^^^^^^^^^^
+   |                   |
+   |                   consider requiring `U` to be `Copy`
 
 error: a `const` item should never be interior mutable
   --> $DIR/declare_interior_mutable_const.rs:87:5
    |
 LL |     const T_ASSOC: T::NonCopyType = T::ASSOC;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^--------------^^^^^^^^^^^^
+   |                    |
+   |                    consider requiring `<T as Trait<u32>>::NonCopyType` to be `Copy`
 
 error: aborting due to 13 previous errors