github.com/iotexproject/iotex-core@v1.14.1-rc1/action/protocol/execution/testdata-london/difficulty.sol (about)

     1  // SPDX-License-Identifier: MIT
     2  
     3  pragma solidity =0.8.17;
     4  
     5  contract Difficulty {
     6  
     7      function diffi() public view returns (uint256 r) {
     8          assembly {
     9              r := difficulty()
    10          }
    11      }
    12  }