# Fresh review cases

These are prepared snippets, not recorded AI output. Review them against the task before reading the answer key. `createSaveGate` has the tested implementation from `save-gate.ts`.

## Case A

```ts
async function handlePress() {
  const runSave = createSaveGate();
  await runSave(save);
}
```

## Case B

```ts
let pending = false; // Retained for this one owner.
async function runSave(task: () => Promise<void>) {
  if (pending) return;
  pending = true;
  await task();
  pending = false;
}
```

## Case C

```ts
const runSave = useRef(createSaveGate()).current;
async function handlePress() {
  await runSave(save);
}
```

## Case D

```tsx
const runSave = useRef(createSaveGate()).current;
async function handlePress() {
  await runSave(save);
}
return <AppButton disabled={false} onPress={handlePress} title="Save" />;
```

For this exercise the caller in Cases C and D handles rejected promises outside the shown snippet. Focus the concurrency review on gate lifetime and admission. Separately state which busy/error UI behaviors cannot be established from the snippet. Do not invent missing host code.