Function views 

pub fn views(
    command: &str,
    host: &dyn Host,
    a: EvalArgs<'_>,
    resolver: &dyn Resolver,
    rules: &mut RulesHook<'_>,
) -> Res

eval views (spec 041, 3.10.3): the score views of the evaluation eval would run over the same inputs, written to the file out.