ContractLogicError from custom exception contains stringified bytes instead of hex str

[antazoey]

• Version: 0.7.0b1
• Python: 3.9.13
• OS: macOS

What was wrong?

Currently, when you have a custom Solidity exeption type like:

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.4;

error Unauthorized();

contract HasError {
    address payable owner = payable(msg.sender);

    function withdraw() public {
        if (msg.sender != owner)
            revert Unauthorized();

        owner.transfer(address(this).balance);
    }
    // ...
}

and you purposely trigger the error, you get an exception with the following message:

TransactionFailed("execution reverted: b'\\x82\\xb4)\\x00'")

It is great! But when parsing into a python script, it can be awkward because it is a bytes string enclosed within an actual string.

How can it be fixed?

Before putting the reason in the exception message, convert it to a hex str such that the output is:

TransactionFailed("execution reverted: 0x82b42900")

Fill this section in if you know how this could or should be fixed.