solidity/test/libsolidity/syntaxTests/operators/custom/duplicated_using_directive.sol

type Int is int32;

using {add as +} for Int;
using {add as +} for Int;

function add(Int, Int) pure returns(Int) {
    return Int.wrap(0);
}

function f() pure {
    Int.wrap(0) + Int.wrap(0);
}

// ----