Feature request: if x.is_some() -> if let Some(_tmp) = x

[vi]

Before:

if x.is_┃some() {
    ...
}

After:

if let Some(┃_tmp) = x {
    ...
}

[ice1000]

I'll take it, it seems useful

[vi]

Maybe transformation of if my_result.is_ok() { to if let Ok(_x) = my_result { should be implemented along the way?

[Young-Flash]

@ice1000 hi, would you like to make it? if you have no time, I'd like to try. seems interesting.

[ice1000]

@ice1000 hi, would you like to make it? if you have no time, I'd like to try. seems interesting.

I checked a bit and I found an entire assist too involved. I got too confident about myself after modifying a bit of existing assists. Please give it a shot!