Parse Panic Solidity 0.8 revert data (as found in overflow)

[frangio]

Solidity 0.8 introduced a new Panic(uint256) encoding for revert data, used in Solidity built-in errors such as overflow. This is a new alternative to the existing Error(string) encoding.

From a quick test using hardhat console and hardhat-ethers, triggering an overflow prints Error: Transaction reverted for an unrecognized reason..

// SPDX-License-Identifier: Unlicense
pragma solidity 0.8.0;

contract Panic {
    function test() public returns (uint) {
        return uint(0) - uint(1);
    }
}

This should produce an error with a message that identifies it as a panic, together with the corresponding error code. We want to extend expectRevert from OpenZeppelin Test Helpers to detect panics as well.

[frangio]

Any updates on this? 🙂

[alcuadrado]

We'll probably start working on this after this week's release.

[fvictorio]

Hardhat 2.4.0 now supports panic codes 🎉