I am trying to compile the following code:

pragma solidity ^0.5.1;

contract MKotET1_1{
   address payable king; uint public claimPrice = 100;

   function calculateCompensation() public returns(uint) {

function( ) external payable {
   if (msg.value  < claimPrice) revert();
      uint compensation = calculateCompensation();
      (bool success, bytes memory returnMessage) = 
      king = msg.sender;

I am getting following warning message:

solc MKotET_stackExchange.sol MKotET_stackExchange.sol:11:26: Warning: Unused local variable. (bool success, bytes memory returnMessage) = king.call.value(compensation)(""); ^------------------------^

Somebody please guide me how to remove this warning message.


  • Why do you want to silence the warning?
    – user19510
    Jun 22, 2019 at 18:33
  • Contract owner won't like it. Also warning means something wrong going on, not good from software engineering point of view
    – zak100
    Jun 22, 2019 at 18:59

1 Answer 1


You do not need to explicitly state the second variable declaration. You can write it as follows:

(bool success, ) = king.call.value(compensation)("");

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