ethers-derive-eip712 impossible to use

[the-emerald]

Version

├── ethers v0.14.0
│   ├── ethers-addressbook v0.14.0
│   │   ├── ethers-core v0.14.0
│   ├── ethers-contract v0.14.0
│   │   ├── ethers-contract-abigen v0.14.0
│   │   │   ├── ethers-core v0.14.0 (*)
│   │   ├── ethers-contract-derive v0.14.0 (proc-macro)
│   │   │   ├── ethers-contract-abigen v0.14.0
│   │   │   │   ├── ethers-core v0.14.0 (*)
│   │   │   ├── ethers-core v0.14.0 (*)
│   │   ├── ethers-core v0.14.0 (*)
│   │   ├── ethers-providers v0.14.0
│   │   │   ├── ethers-core v0.14.0 (*)
│   ├── ethers-core v0.14.0 (*)
│   ├── ethers-etherscan v0.14.0
│   │   ├── ethers-core v0.14.0 (*)
│   ├── ethers-middleware v0.14.0
│   │   ├── ethers-contract v0.14.0 (*)
│   │   ├── ethers-core v0.14.0 (*)
│   │   ├── ethers-etherscan v0.14.0 (*)
│   │   ├── ethers-providers v0.14.0 (*)
│   │   ├── ethers-signers v0.14.0
│   │   │   ├── ethers-core v0.14.0 (*)
│   ├── ethers-providers v0.14.0 (*)
│   └── ethers-signers v0.14.0 (*)
└── ethers-derive-eip712 v0.14.0 (proc-macro)
    ├── ethers-core v0.14.0 (*)

Platform

Linux DESKTOP-GR484G2 5.10.102.1-microsoft-standard-WSL2 #1 SMP Wed Mar 2 00:30:59 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Description
https://github.com/the-emerald/eip712-verifying-contract see this repo for a minimum reproducible example.

It is impossible to get the eip712 proc-macro to work, as it complains about:

error: missing required domain attribute: 'verifying_contract'
 --> src/main.rs:5:3
  |
5 | #[eip712(
  |   ^^^^^^

error: could not compile `eip712` due to previous error

even though clearly in the MRE the field is present.

[the-emerald]

Update: The following fixed the code:

use ethers::prelude::*;
use ethers_derive_eip712::*;
+ use ethers::types::transaction::eip712::Eip712;

#[derive(Debug, Clone, Eip712, EthAbiType)]
#[eip712(
    name = "Postcard",
    version = "1",
    chain_id = 1,
+    verifying_contract = "0x0000000000000000000000000000000000000001",
-    verifying_contract = "0x0000000000000000000000000000000000000000",
    salt = "and-pepper"
)]
pub(crate) struct PostcardClaim {
    pub foo: String,
}

fn main() {
    println!("Hello, world!");
}

and also hex, serde_json need to be added as a dependency.

Perhaps the docs should be updated to reflect this, or the dependencies can be brought alongside ethers-derive-eip712 so the consumer doesn't have to pull them in?