error[E0599]: the method `check` exists for struct `Client<()>`, but its trait bounds were not satisfied
  --> $DIR/track-obligations.rs:83:16
   |
LL | struct ALayer<C>(C);
   | ---------------- doesn't satisfy `ALayer<()>: ParticularServiceLayer<()>`
...
LL | struct AService;
   | --------------- doesn't satisfy `<AService as Service<Req>>::Response = Res`
...
LL | struct Client<C>(C);
   | ---------------- method `check` not found for this struct
...
LL |     Client(()).check();
   |                ^^^^^ method cannot be called on `Client<()>` due to unsatisfied trait bounds
   |
note: trait bound `<AService as Service<Req>>::Response = Res` was not satisfied
  --> $DIR/track-obligations.rs:24:21
   |
LL | impl<T> ParticularService for T
   |         -----------------     -
LL | where
LL |     T: Service<Req, Response = Res>,
   |                     ^^^^^^^^^^^^^^ unsatisfied trait bound introduced here

error[E0271]: type mismatch resolving `<AService as Service<Req>>::Response == Res`
  --> $DIR/track-obligations.rs:87:11
   |
LL |     check(());
   |     ----- ^^ type mismatch resolving `<AService as Service<Req>>::Response == Res`
   |     |
   |     required by a bound introduced by this call
   |
note: expected this to be `Res`
  --> $DIR/track-obligations.rs:60:21
   |
LL |     type Response = bool;
   |                     ^^^^
note: required for `AService` to implement `ParticularService`
  --> $DIR/track-obligations.rs:22:9
   |
LL | impl<T> ParticularService for T
   |         ^^^^^^^^^^^^^^^^^     ^
LL | where
LL |     T: Service<Req, Response = Res>,
   |                     -------------- unsatisfied trait bound introduced here
note: required for `ALayer<_>` to implement `ParticularServiceLayer<_>`
  --> $DIR/track-obligations.rs:40:12
   |
LL | impl<T, C> ParticularServiceLayer<C> for T
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^     ^
...
LL |     T::Service: ParticularService,
   |                 ----------------- unsatisfied trait bound introduced here
note: required by a bound in `check`
  --> $DIR/track-obligations.rs:76:36
   |
LL | fn check<C>(_: C) where ALayer<C>: ParticularServiceLayer<C> {}
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `check`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0271, E0599.
For more information about an error, try `rustc --explain E0271`.