--> gping/src/main.rs:486:26
 |

|                          ^^^^^^^^^^^ cannot infer type of the type parameter `C` declared on the method `constraints`

|                                  ------ type must be known at this point
|
= note: multiple `impl`s satisfying `Vec<Constraint>: AsRef<_>` found in the `alloc` crate:
        - impl<T, A> AsRef<Vec<T, A>> for Vec<T, A>
          where A: Allocator;
        - impl<T, A> AsRef<[T]> for Vec<T, A>
          where A: Allocator;

|

|                                     ++++++