Lamports not working when dealing with AccountInfo within Solang

Question

When trying to build a program with this function (from one of the exmaples given):

    function transferSolWithCpi(uint64 lamports) public {
        AccountInfo from = tx.accounts[0]; // first account must be an account owned by the program
        AccountInfo to = tx.accounts[1]; // second account must be the intended recipient

        print("From: {:}".format(from.key));
        print("To: {:}".format(to.key));

        from.lamports -= lamports;
        to.lamports += lamports;
    }

I get a failed build saying:

error: assigning to incorrect type uint64
   ┌─ /mnt/c/<my-path>/solidity/tryPay.sol:38:14
   │
38 │         from.lamports -= lamports;

Does anybody know how I can fix this? I copied the exact same code as in the example

Answer 1

Try using v0.3.2 of Solang, which seems to include the fix https://github.com/hyperledger/solang/releases/tag/v0.3.2

Solana The lamports and data fields of tx.accounts can be modified again.