Queryable, Insertable derivations not compiling on 1.14.0-nightly

[stearnsc]

I'm not super plugged in to the ecosystem developments, so sorry if I missed something obvious.

I just updated to 1.14.0-nightly, and my diesel code stopped compiling. I went back to the guide to create the simplest failure I could, which is here:

lib.rs:

#![feature(proc_macro)]

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

use diesel::prelude::*;

pub mod models {
	use super::schema::posts;

	#[derive(Debug, Queryable)]
	pub struct Post {
		pub id: i32,
		pub title: String,
		pub body: String,
		pub published: bool,
	}

	#[derive(Debug, Insertable)]
	#[table_name = "posts"]
	pub struct NewPost {
		pub title: String,
		pub body: String,
		pub published: bool,
	}
}

pub mod schema {
	table! {
		posts {
			id -> Integer,
			title -> Text,
			body -> Text,
			published -> Bool,
		}
	}
}

Cargo.toml:

[package]
name = "diesel_test"
version = "0.1.0"

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

output:

$ cargo build
   Compiling diesel_test v0.1.0 (file:///Users/cstearns/workspace/diesel_test)
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/lib.rs:11:18
   |
11 | 	#[derive(Debug, Queryable)]
   | 	                ^^^^^^^^^
   |
   = help: add #![feature(custom_derive)] to the crate attributes to enable

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/lib.rs:19:18
   |
19 | 	#[derive(Debug, Insertable)]
   | 	                ^^^^^^^^^^
   |
   = help: add #![feature(custom_derive)] to the crate attributes to enable

error: aborting due to 2 previous errors

error: Could not compile `diesel_test`.

To learn more, run the command again with --verbose.

It's suggesting adding custom_derive, but that feels like the wrong fix, given that it's about to go away entirely. Any ideas?

[sgrif]

Swap the order of extern crate diesel; and extern crate diesel_codegen. I've opened #495 which has the root cause to discuss what we can do to make this workaround unnecessary.