False positive with rayon's `into_par_iter`, `fold` and `reduce`

[jorgecarleitao]

Since I am at it, thanks a lot for this amazing piece of software!

Minimal repro I could come up with:

use std::collections::HashMap;

use rayon::prelude::*;

type C = HashMap<u64, (Vec<u64>, Vec<u64>)>;

fn main() {
    let a = vec![1u64];
    a.into_par_iter()
        .enumerate()
        .fold(C::default, |_, _| todo!())
        .reduce(C::default, |acc, other| todo!());
}

it shows as an error in VS code with the configuration below, but it compiles fine. Changing to type C = HashMap<u64, (u64, u64)>; does not show the error.

rust-analyzer version: rust-analyzer version: 7d6fcbc0b 2021-12-06 stable

rustc version: rustc 1.56.1 (59eed8a2a 2021-11-01)

[martinxyz]

Confirmed. Most likely a duplicate of #10822. According to the help, it picks reduce from the Iterator trait instead of Paralllelterator.

[lnicola]

Probably fixed in #11074: