1. In the bin folder, create a file called conversion.rs.

2. Add the following code and run it with cargo run --bin conversion:

1    use std::ops::MulAssign; 
2    use std::fmt::Display;
3 
4    // This structure doubles all elements it stores
5    #[derive(Debug)]
6    struct DoubleVec<T>(Vec<T>);
7 
8 
9    // Allowing conversion from a Vec<T>,
10   // where T is multipliable with an integer
11   impl<T> From<Vec<T>> for DoubleVec<T>
12   where
13   T: MulAssign<i32>,
14   {
15     fn from(mut vec: Vec<T>) -> Self {
16       for elem in &mut vec {
17         *elem *= 2;
18       }
19       DoubleVec(vec)
20     }
21   }
22 
23   // Allowing conversion from a slice of Ts
24   // where T is again multipliable with an integer
25   impl<'a, T> From<&'a [T]> for DoubleVec<T>
26   where
27   T: MulAssign<i32> + Clone,
28   {
29     fn from(slice: &[T]) -> Self {
30       // Vec<T: MulAssign...