1fn expand(arguments: Arguments, mut item: ItemEnum) -> syn::Result<Tok
2    let Arguments {
3        method_name: method,
4        return_type: output,
5        missing,
6    } = arguments;
7    let mut outputs = Vec::with_capacity(item.variants.len());
8    let mut has_runtime_output = false;
9    let mut optional = false;
10    for variant in &mut item.variants {
11        let discriminant = variant
12            .discriminant
13            .take()
14            .map(|(eq, expression)| (eq, ungroup::expr(&expression).cl
15
16        let output = match (&variant.fields, discriminant) {
17            (
18                Fields::Unnamed(fields),