Compiler version incompatibility nightmare

Question

I'm new to Solidity and Truffle. I'm trying to compile my Solidity code within Truffle to create an ERC-20 token. I have @truffle/hdwallet-provider and @openzeppelin/contracts as my dependencies. Now, I only have two Solidity files, both of which have pragma solidity ^0.6.0;. I have been uninstalling and reinstalling to different versions and changing the compiler version in truffle-config.js to whichever the error message is telling me to change as well as changing the pragma solidity versions in the two files I have. I also had to change the individual files in node modules to fit the right version.

Finally, I think the change in the version from ^0.6.2 to ^0.6.0 broke a file called Address.sol in the utility folder of contracts in Node Modules:

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{ value: amount }(""); // here
        require(success, "Address: unable to send value, recipient may have reverted");
    }

The error message shows:

ParserError: Expected ';' but got '{'

indicating the point right after call.

First, how do I fix this? And second, is this version incompatibility issue what I should expect every time there's been updates in either Truffle, Solidity, or any of my dependencies?

Answer 1

The reason the compilation stopped working is because that way of performing a call was only made available in Solidity 0.6.2:

Allow gas and value to be set in external function calls using c.f{gas: 10000, value: 4 ether}().

Prior to 0.6.2, you had to use c.gas(_gasLimit).value(_value)(_data);

This change is simply an added feature and not a breaking change. You can use the latter call format for any version of solidity, both pre- and post- 0.6.2. The new version was introduced as a convenience and not as a mandatory way to do it.