error[E0599]: no method named `serialize` found for enum `FooRequest` in the current scope
 --> tests/compile_fail/no_serde1/no_implicit_serde_without_feature.rs:8:7
  |
1 | #[lrcall::service]
  | ----------------- method `serialize` not found for this enum
...
8 |     x.serialize();
  |       ^^^^^^^^^ method not found in `FooRequest`
  |
  = help: items from traits can only be used if the trait is implemented and in scope
  = note: the following trait defines an item `serialize`, perhaps you need to implement it:
          candidate #1: `serde::ser::Serialize`