solidity/test/libsolidity/smtCheckerTests/imports/import_library_2.sol

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2021-04-29 13:35:57 +00:00
==== Source: Address.sol ====
pragma solidity ^0.8.0;
library Address { function s() internal pure {} }
==== Source: ERC20.sol ====
pragma solidity ^0.8.0;
import "./Address.sol";
library SafeMath {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
}
contract ERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
function transferFrom(uint256 amount) public view {
_balances[msg.sender].sub(amount);
}
}
// ====
// SMTEngine: all
// ----
// Warning 3944: (ERC20.sol:157-162): CHC: Underflow (resulting value less than 0) happens here.