I'm using the Rust clap derive library and have defined a CLI flag with 
```
#[clap(long, hide = true, env = "TURBO\_RUN\_SUMMARY")]
pub summarize: Option,
```

How do I change this code so it can accept `--summarize` as a CLI flag without a value and it will be interpreted the same as `--summarize=true`?
user
{"source": "ewof/sharegpt-instruct-unfiltered-deduped", "kind": "human", "evolved_from": null}
I'm using the Rust clap derive library and have defined a CLI flag with 
```
#[clap(long, hide = true, env = "TURBO\_RUN\_SUMMARY")]
pub summarize: Option,
```

How do I change this code so it can accept `--summarize` as a CLI flag without a value and it will be interpreted the same as `--summarize=true`?
user
DUMMY RESPONSE
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