check reverse inference of closure return type for zip_with

[MusicalNinjaDad]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• In the new test, consider using |_, _| () instead of Default::default() to make the intended unit return type explicit and avoid relying on Default for clarity.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In the new test, consider using `|_, _| ()` instead of `Default::default()` to make the intended unit return type explicit and avoid relying on `Default` for clarity.

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