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One way to determine whether all elements from one Vec are included in another Vec is to use the contains method of the second Vec iteratively for each element in the first Vec. If all elements from the first Vec are found in the second Vec, then the method should return true. Here's an example code snippet:

fn main() {
    let vec1 = vec![1, 2, 3, 4];
    let vec2 = vec![2, 3, 4, 5];

    let is_included = vec1.iter().all(|e| vec2.contains(e));

    println!("{}", is_included);
}

In this example, vec1 is the Vec whose elements we want to check for inclusion in vec2. We use the all method on the iterator of vec1 to check if all of its elements satisfy a certain condition, which in this case is whether they are included in vec2. The contains method returns true if the specified element is in the Vec. The resulting boolean value is_included will be true if all elements in vec1 are found in vec2, and false otherwise.