error: GraphQL union expects trait method to accept `&self` only and, optionally, `&Context`
--> fail/union/trait_wrong_method_input_args.rs:5:10
|
5 | fn a(&self, ctx: &(), rand: u8) -> Option<&Human>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^
= note: https://spec.graphql.org/October2021#sec-Unions