feat: complete locals in record field

[A4-Tacks]

Example

fn outer() {
    let foo = 3;
    {
        let bar = 3;
        struct Foo {
            b$0
        }
        let baz = 3;
        let qux = 3;
    }
    let fez = 3;
}

Completes:

bn bar: i32,
bn baz: i32,
bn foo: i32,
kw pub
kw pub(crate)
kw pub(super)

[ChayimFriedman2]

I feel like local structs, especially in the middle of a function, are rare enough to not justify this.

[A4-Tacks]

This can be temporary, first creating a structure within the function and then move it to the top level

This assist is very useful when refactoring large functions

[ChayimFriedman2]

I've never done that and I fail to even imagine how it'll be useful.

I don't want this, but CC @rust-lang/rust-analyzer.

[Veykril]

I agree, this seems to have little value and in fact might even be confusing at times due to showing non fields here,

[A4-Tacks]

confusing at times due to showing non fields here,

This was originally only a completion for visibility, I think there's no problem