Compiling `diesel_codegen` with no features gives a less than useful error message

[sgrif]

diesel = { version = "0.9.0", features = ["postgres"] }
diesel_codegen = "0.9.0"

#[macro_use] extern crate diesel;
#[macro_use] extern crate diesel_codegen;

infer_schema!("dotenv:DATABASE_URL");

error: `#[derive]` for custom traits is not stable enough for use. It is deprecated and will be removed in v1.15 (see issue #29644)
  --> src/main.rs:15:1
   |
15 | infer_schema!("dotenv:DATABASE_URL");
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate

[killercup]

Is there a nice way to do this? All I can think of is something like

#[cfg(not(any(feature = "sqlite", feature = "postgres")))]
mod hello_you_need_enable_one_of_the_backend_adapters_as_cargo_feature_thank_you;

[sgrif]

We just need to implement the derives that are behind a cfg flag to give a more specific error when called.

…

On Tue, Jan 10, 2017, 9:20 AM Pascal Hertleif ***@***.***> wrote: Is there a nice way to do this? All I can think of is something like #[cfg(not(any(feature = "sqlite", feature = "postgres")))]mod hello_you_need_enable_one_of_the_backend_adapters_as_cargo_feature_thank_you; — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#570 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABdWK7DlGUF5trvNMvzuL7fY_4ylZzuxks5rQ5OLgaJpZM4LejmM> .

[sgrif]

This was fixed a while back when compile_error! was stabilized.