Demo that a fallback appears to return true

fallback.sol

pragma solidity ^0.4.19;

contract shift {
    
    function () public {
       
    }
}

contract IToken {
    function tokenFallBack() public returns (bool);
}

contract B {
    
    
    function test(address a) public view returns (bool) {
        IToken x = IToken(a);
        return x.tokenFallBack();
    }
    
}