Abstract

Let's add support of type(State).typehash for structs, returning bytes32 hashed stringed structure.

Motivation

EIP-712 type hashes are pretty popular among smart contract of different companies. I believe it makes sense to support it on Solidity language layer.

Specification

bytes32 constant public STATE_TYPEHASH = keccak256(
    "State("
        "uint256 nonce,"
        "uint256 totalSpent,"
        "uint256 totalRefunded"
    ")"
);

=>

struct State {
    uint256 nonce;
    uint256 totalSpent;
    uint256 totalRefunded;
}

bytes32 constant public STATE_TYPEHASH = type(State).typehash;

Backwards Compatibility

Not sure