Function for_loop 

pub async fn for_loop<W, I, S, E>(
    name: E::VarName,
    words: I,
    body: S,
    env: &mut E,
) -> Result<BoxFuture<'static, ExitStatus>, S::Error>
where
    I: IntoIterator<Item = W>,
    W: WordEval<E>,
    S: Spawn<E>,
    S::Error: From<W::Error>,
    E: ?Sized + LastStatusEnvironment + VariableEnvironment,
    E::VarName: Clone,
    E::Var: From<W::EvalResult>,

Spawns a for loop with all the fields when words are evaluated.

For each element in the environment’s arguments, name will be assigned with its value and body will be executed.