diesel: Fix reexported error types #301
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The error type passed into `managed_reexports!()` generates two type aliases: `PoolError<E>` and `HookError<E>`. `PoolError<M::Error>` is used e.g. by the `get()` fn of managed pools. But `M::Error` for the `Manager` in the `deadpool_diesel` crate is defined as `deadpool_diesel::Error`, not `diesel::ConnectionError`, which makes the reexport wrong or at least not as useful as it is meant to be. Interestingly, there is another `PoolError` type alias in the root module of `deadpool_diesel` with the correct generic type signature. `HookError<M::Error>` is used e.g. in the `post_create()` fn of the managed pool builders. As above, `M::Error` is defined as `deadpool_diesel::Error`, not `diesel::ConnectionError`. In this case there is no correct root module type alias either, which requires users to add a dependency on `deadpool` itself to get to the generic, non-type-alias variant of `HookError`.
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The error type passed into
managed_reexports!()generates two type aliases:PoolError<E>andHookError<E>.PoolError<M::Error>is used e.g. by theget()fn of managed pools. ButM::Errorfor theManagerin thedeadpool_dieselcrate is defined asdeadpool_diesel::Error, notdiesel::ConnectionError, which makes the reexport wrong or at least not as useful as it is meant to be. Interestingly, there is anotherPoolErrortype alias in the root module ofdeadpool_dieselwith the correct generic type signature.HookError<M::Error>is used e.g. in thepost_create()fn of the managed pool builders. As above,M::Erroris defined asdeadpool_diesel::Error, notdiesel::ConnectionError. In this case there is no correct root module type alias either, which requires users to add a dependency ondeadpoolitself to get to the generic, non-type-alias variant ofHookError.