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You can use the extend method of the Vec type to add elements from an array into a vector in Rust. Here's an example:
let arr = [1, 2, 3];
let mut vec = Vec::new();
vec.extend(&arr);
println!("{:?}", vec); // Output: [1, 2, 3]
In this example, we first create an array arr with the values [1, 2, 3]. We then create an empty vector vec using the Vec::new() function. We then use the extend method to add the elements of the array to the vector.
Note that we pass a reference to the array &arr to the extend method. This is because the extend method accepts an iterable, and arrays in Rust are not directly iterable. However, we can pass a reference to the array, which implements the IntoIterator trait, to the extend method to add its elements to the vector.