Another kind of manual map

What it does

Replace Some(f(...?)) or Ok(f(...)?) as a return value with (...).map(f). Potentially an addition to manual_map.

Advantage

Clearer, has less nesting, and can be more concise. Helps discoverability of Option::map etc.

Drawbacks

Can be less concise.

Example

fn maybe_len(maybe_string: Option<&str>) -> Option<usize> {
    Some(maybe_string?.len())
}

Could be written as:

fn maybe_len(maybe_string: Option<&str>) -> Option<usize> {
    maybe_some_string.map(|s| s.len())
}

Start by reading the proposed transformation and the existing manual_map lint in rust-clippy. Determine which Some(f(...?)) and Ok(f(...)?) return expressions should be covered, how the stated drawbacks affect applicability, and what tests are needed to confirm the rewrite is correct.