Move data outside of `.filter_map` and false positve `unnecessary_filter_map`

Summary

Clippy propose to use .filter instead of .filter_map but in .filter we have an item reference while in .filter_map item itself and can move this item to some outside variable.

Lint Name

unnecessary_filter_map

Reproducer

I tried this code:

fn main() {
    let mut vec = vec![];
    let data = (0..10)
        .collect::<Vec<_>>()
        .into_iter()
        .filter_map(|v| {
            if v % 2 == 0 {
                vec.push(v);
                None
            } else {
                Some(v)
            }
        })
        .collect::<Vec<_>>();
    println!("{:?} {:?}", vec, data);
}

I saw this happen:

    Checking playground v0.0.1 (/playground)
warning: this `.filter_map` can be written more simply using `.filter`
  --> src/main.rs:3:16
   |
3  |       let data = (0..10)
   |  ________________^
4  | |         .collect::<Vec<_>>()
5  | |         .into_iter()
6  | |         .filter_map(|v| {
...  |
12 | |             }
13 | |         })
   | |__________^
   |
   = note: `#[warn(clippy::unnecessary_filter_map)]` on by default
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map

warning: `playground` (bin "playground") generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 0.36s

I expected to see this happen:

Version

rustc 1.64.0-nightly (f8588549c 2022-07-18)
binary: rustc
commit-hash: f8588549c3c3d45c32b404210cada01e2a45def3
commit-date: 2022-07-18
host: x86_64-unknown-linux-gnu
release: 1.64.0-nightly
LLVM version: 14.0.6

Additional Labels

No response

Start by locating the unnecessary_filter_map lint and reproduce the reported Rust example. Check how the lint handles closures that move items into an outside variable, then add coverage for this case and verify the false-positive warning is gone without changing valid lint behavior.