Generator throw behavior

test.js

const item = {
  done: true,
  value: null,
};

function* wrap(source) {
  try {
    yield* source;
  } catch (e) {
    // this never happens
    process.exit(0);
  } finally {
    // this also never happens
    process.exit(0);
  }
}

const test = wrap({
  [Symbol.iterator]: () => ({
    next: () => item,
  }),
});

test.throw('junk');

/**
>$ node --trace-uncaught test.js

test.js:6
function* wrap(source) {
              ^
junk
Thrown at:
    at wrap (test.js:6:15)
    at test.js:24:11

>$ echo $?
1
*/