Function second 

pub fn second<A, B, Env, E1, E2>(
    e1: E1,
    e2: E2,
) -> BoxedEffect<B, AnalysisError, Env>
where
    A: Send + 'static,
    B: Send + 'static,
    Env: Clone + Send + Sync + 'static,
    E1: Effect<Output = A, Error = AnalysisError, Env = Env> + Send + 'static,
    E2: Effect<Output = B, Error = AnalysisError, Env = Env> + Send + 'static,

Run the first effect, returning the second’s value.

This is useful when the first effect has side effects but you want the second’s result.

Example

let effect = second(setup_context(), compute_result());
// Returns compute_result's value, but setup_context runs first