fn from(array: [T; N]) -> Box<[T]> {
        box array
    }
Attempt to downcast the box to a concrete type.

# Examples

```
use std::any::Any;

fn print_if_string(value: Box<dyn Any + Send + Sync>) {
if let Ok(string) = value.downcast::<String>() {
println!("String ({}): {}", string.len(), string);
benchmarks/haystacks/code/rust-library.rs