check for if-some-or-ok-else-none-or-err

[J-ZhengLi]

fixes: #8492

---

changelog: make [option_if_let_else] to check for match expression with both Option and Result; TODO: Change lint name? Add new lint with similar functionality?

[rust-highfive]

r? @flip1995

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[bors]

☔ The latest upstream changes (presumably #8705) made this pull request unmergeable. Please resolve the merge conflicts.

[J-ZhengLi]

Well... I forgor that I did for this PR already, may I request a feedback anyway? @flip1995

[Serial-ATA]

Should the lint be renamed if it's going to cover match now as well? Just saw you already asked that 😄.

[Serial-ATA]

I think this should only check for arms that span a single line.

I don't think going from

let _ = match res {
    Err(_) => 1,
    Ok(mut a) => {
        a += 1;
        println!("{a}");
        a -= 1;
        let b = 5;
        a += b;
        a
    }
};

to

let _ = res.map_or(1, |mut a| {
        a += 1;
        println!("{a}");
        a -= 1;
        let b = 5;
        a += b;
        a
    });

makes much of a difference.

[flip1995]

Thanks! Sorry for taking so long. I rebased it and did a minor cleanup. About the lint name: Yes it will need to be changed. But since this lint is currently in nursery there's no rush to decide this now. I added a FIXME comment for it.

@bors r+

[bors]

📌 Commit 1f75845 has been approved by flip1995

It is now in the queue for this repository.

[bors]

⌛ Testing commit 1f75845 with merge 87b3afc...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: flip1995
Pushing 87b3afc to master...