Much like with query structs cynic expects you to own any enums you want to query for, or provide as arguments. The cynic::Enum trait is used to define an enum, and the easiest way to define that trait is to derive it:

fn main() {
#[derive(cynic::Enum, Clone, Copy, Debug)]
#[cynic(graphql_type = "Market")]
pub enum Market {

The derive will work on any enum that only has unit variants that match up with the variants on the enum in the schema. If there are any extra or missing variants, the derive will emit errors.

By default the variant names are expected to match the GraphQL variants exactly, but this can be controlled with either the rename_all top level parametr or the rename variant parameter.