bad get_unwrap suggestion

[isonmad]

let v = vec!["a","b"];
let _: Vec<_> = v.get(0..1).unwrap().to_vec();
//              ^^^^^^^^^^^^^^^^^^^^ help: try this: `&v[0..1]`

The suggestion changes the result to &Vec instead of Vec, so it doesn't compile. It has to be v[0..1] or (&v[0..1]) instead.

[oli-obk]

We should

1. use the Sugg suggestion builder (easy)
2. optimize Sugg to produce v[foo].bar() instead of (&v[foo]).bar() (medium difficulty)

[ms2300]

Can I take a shot at this issue?

[oli-obk]

It's all yours. Don't hesitate to ask here, on irc or on discord if you have any questions or just open a PR with any (no matter how unfinished) code that you already have.

[ms2300]

Awesome thank you, I'll let you know if I have any questions

[ms2300]

Sorry for this ticket taking a bit longer than I thought, haven't had much time to concentrate. Besides the modified / new test, the fi should probably be in clippy_lints/src/utils/sugg.rs right?

Edit: fi -> fix, I can type 95% of the time I promise

[oli-obk]

"fi"?

You should only have to modify sugg.rs for the second part of this issue. The first one should just use the Sugg type.

[ms2300]

Cool, I'll have a fix soon. Thanks for the point in the right direction!

[ms2300]

I haven't made any progress on this ticket b/c I honestly don't fundamentally understand how to make the modification. I'm confused as to what part of the code actually recommends the fix for this problem and therefore don't even know where to begin :/

[oli-obk]

The suggestion is produced by the format! call in https://github.com/rust-lang-nursery/rust-clippy/blob/c81d70e6bdf264c62136b571760f152be9638ec0/clippy_lints/src/methods.rs#L1421