abigen does not recognize error types

[jannikluhn]

System information

abigen version: 1.10.5-unstable-3b053185-20210702 (master)

Expected behaviour

abigen should not fail when receiving an ABI that contains error types.

Actual behaviour

It fails.

Steps to reproduce the behaviour

Example contract:

// SPDX-License-Identifier: MIT

pragma solidity =0.8.4;

contract Test {
    error MyError(uint256);
}

Resulting abi (generated with solc version 0.8.4+commit.c7e474f2.Linux.g++):

[
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "name": "MyError",
    "type": "error"
  }
]

Error on abigen --abi Test.abi --pkg main:

Fatal: Failed to generate ABI binding: abi: could not recognize type error of field MyError

[MariusVanDerWijden]

Yep, we don't have the type "error" in abigen yet, I'll implement it