Fix issues from #83

[tomhoule]

The CLI is not at a point where it can produce useful error messages.

Credit goes to @djc for the bug report and the solution (see #83).

[djc]

With this branch, I get a number of errors that I didn't get with master just now:

warning: proc macro crates and `#[no_link]` crates have no effect without `#[macro_use]`
  --> /Users/djc/src/graphql-client/src/lib.rs:11:1
   |
11 | pub extern crate graphql_query_derive;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

   Compiling trackpay v0.1.0 (file:///Users/djc/src/trackpay)
error[E0277]: `create_entity::Currency` doesn't implement `std::fmt::Debug`
  --> tests/simple.rs:19:10
   |
19 | #[derive(GraphQLQuery)]
   |          ^^^^^^^^^^^^ `create_entity::Currency` cannot be formatted using `{:?}`
   |
   = help: the trait `std::fmt::Debug` is not implemented for `create_entity::Currency`
   = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
   = note: required because of the requirements on the impl of `std::fmt::Debug` for `&create_entity::Currency`
   = note: required for the cast to the object type `std::fmt::Debug`

error[E0277]: `create_entity::Currency` doesn't implement `std::fmt::Debug`
  --> tests/simple.rs:19:10
   |
19 | #[derive(GraphQLQuery)]
   |          ^^^^^^^^^^^^ `create_entity::Currency` cannot be formatted using `{:?}`
   |
   = help: the trait `std::fmt::Debug` is not implemented for `create_entity::Currency`
   = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
   = note: required because of the requirements on the impl of `std::fmt::Debug` for `&create_entity::Currency`
   = note: required for the cast to the object type `std::fmt::Debug`

error[E0277]: `create_entity::ResponseData` doesn't implement `std::fmt::Debug`
  --> tests/simple.rs:31:29
   |
31 |     println!("RESULT {:?}", result);
   |                             ^^^^^^ `create_entity::ResponseData` cannot be formatted using `{:?}`
   |
   = help: the trait `std::fmt::Debug` is not implemented for `create_entity::ResponseData`
   = note: add `#[derive(Debug)]` or manually implement `std::fmt::Debug`
   = note: required because of the requirements on the impl of `std::fmt::Debug` for `graphql_client::GraphQLResponse<create_entity::ResponseData>`
   = note: required by `std::fmt::Debug::fmt`

error: aborting due to 3 previous errors

(Currency is a custom enum in my project.)

[djc]

Actually this now happens with both branches -- which is confusing to me, because I had this working just a few minutes earlier.

[tomhoule]

It's a breaking change in the latest master: now you can place arbitrary derives on the generated response types. The only trait derived by default now is Deserialize, so you have to add response_derives = "Debug" in the #[graphql()] attribute on your structs.

[tomhoule]

Regarding the derives, I'm not sure it's the most ergonomic choice. We could have a reasonable set of defaults and allow users to override it instead, but it feels a little bit more magic.

[djc]

Alright, at least I have something working now. Thanks for your quick turnaround!