Support abstract contracts.

[juharris]

Description
Solidity 0.6 introduces the abstract keyword for abstract contracts: https://solidity.readthedocs.io/en/v0.6.0/contracts.html#abstract-contracts

Works:

// Test.sol
pragma solidity ^0.6;

contract Test {
    uint a = 1;
}

Does not work:

// Test.sol
pragma solidity ^0.6;

abstract contract Test {
    uint a = 1;
}

$ npx solium --file Test.sol

Test.sol
  3:1    error    Syntax error: unexpected token a

✖ 1 error found.

[gorgos]

Likewise the new override keyword.

[elenadimitrova]

Likewise the new receive and fallback functions :)
In general support the 0.6 syntax changes.

[quezak]

Is there a workaround? Or maybe a fork that already has Solidity 0.6 syntax support?

[gorgos]

@quezak You can ignore those files or use https://github.com/protofire/solhint.

[quezak]

I can't ignore all my contract files :D I'll try out if solhint works better, thanks