let simplemacro = macro(arg1, arg2, arg3) => {
    field1 = arg1,
    field2 = arg2,
    field3 = arg3,
};

let cplxmacro = macro(argint, argstr, argfloat) => {
    field1 = argint + 1,
    field2 = argstr + " are here",
    field3 = argfloat - 1.0,
};

let simpleresult = simplemacro(1, 2, 3);
let cplxresult = cplxmacro(1, "We", 3.0);

assert |simpleresult.field1 == 1|;
assert |simpleresult.field2 == 2|;
assert |simpleresult.field3 == 3|;

assert |cplxresult.field1 == 2|;
assert |cplxresult.field2 == "We are here"|;
assert |cplxresult.field3 == 2.0|;