Is there a method of initiating a ThinBox<[T]>?

Question

I have been dabbling in experimental features lately and have been using them for a library I'm building. I am trying to reduce the size of an enum by using ThinBox<[T]> to store contents in a fixed length array without the whole const generics monomorphization business happening in my code (since I need to store this in an enum later and don't want to have a const generic on the level of the enum).

The closest thing I got to a solution is to ThinBox a fixed sized array. (it coerces to a slice). Though it technically does fix the problem of const generics on the type level, I want to find a solution that doesn't require me to input const generics into a function (since it's a lot less flexibility). I also don't want to end up with a ThinBox<&[T]> since that is two levels of indirection.

Is there a method, safe or unsafe, that can initialize a ThinBox<[T]> without directly hacking the compiler?

Answer 1

You can use ThinBox::new_unsize like this:

ThinBox::<[T]>::new_unsize([/* your array */])