look at output of failure tests

[ahl]

In particular, this output from bad_endpoint6.stderr seems to have regressed:

error[E0063]: missing fields `x`, `y` in initializer of `Ret`
  --> $DIR/bad_endpoint6.rs:17:1
   |
17 | / #[endpoint {
18 | |     method = GET,
19 | |     path = "/test",
20 | | }]
   | |__^ missing `x`, `y`

error[E0277]: the trait bound `Ret: serde::ser::Serialize` is not satisfied
  --> $DIR/bad_endpoint6.rs:17:1
   |
17 | / #[endpoint {
18 | |     method = GET,
19 | |     path = "/test",
20 | | }]
   | |__^ the trait `serde::ser::Serialize` is not implemented for `Ret`
   |
   = note: required by `dropshot::HttpResponseOk`

error[E0277]: the trait bound `fn(std::sync::Arc<dropshot::RequestContext>) -> impl std::future::Future {<impl std::convert::From<bad_endpoint> for dropshot::ApiEndpoint>::from::bad_endpoint}: dropshot::handler::    HttpHandlerFunc<_, _>` is not satisfied
  --> $DIR/bad_endpoint6.rs:17:1
   |
17 | / #[endpoint {
18 | |     method = GET,
19 | |     path = "/test",
20 | | }]
   | |__^ the trait `dropshot::handler::HttpHandlerFunc<_, _>` is not implemented for `fn(std::sync::Arc<dropshot::RequestContext>) -> impl std::future::Future {<impl std::convert::From<bad_endpoint> for                dropshot::ApiEndpoint>::from::bad_endpoint}`

That should be referencing the offending code, not the macro.

[ahl]

Closing this as it seems to be a problem in rust 1.46.0:
rust-lang/rust#76360

Things should improve in a subsequent rust release.