contract C is Contract {
modifier m(uint256, ,,, ) {}
// invalid solidity code, but valid pt
modifier m2(uint256) returns (uint256,,,) {}
function f(uint256 a, ) external {}
function f2(uint256 a, , , ,bytes32 b) external returns (uint256,,,,) {}
function f3() external {
try some.invoke() returns (uint256,,,uint256) {} catch {}
}
}