False positive in range_plus_one lint

[jonasbb]

The following program compiles, but clippy produces a warning on it:

extern crate rayon;
use rayon::prelude::*;
fn main() {
    (0..1 + 1).into_par_iter();
}

The warning is:

warning: an inclusive range would be more readable
 --> src/main.rs:4:5
  |
4 |     (0..1 + 1).into_par_iter();
  |     ^^^^^^^^^^ help: use: `(0..=1)`
  |
  = note: #[warn(clippy::range_plus_one)] on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one

However, applying the suggestion results in the following error:

error[E0599]: no method named `into_par_iter` found for type `std::ops::RangeInclusive<{integer}>` in the current scope
 --> src/main.rs:4:13
  |
4 |     (0..=1).into_par_iter();
  |             ^^^^^^^^^^^^^
  |
  = note: the method `into_par_iter` exists but the following trait bounds were not satisfied:
          `std::ops::RangeInclusive<{integer}> : rayon::iter::IntoParallelIterator`
          `&std::ops::RangeInclusive<{integer}> : rayon::iter::IntoParallelIterator`
          `&mut std::ops::RangeInclusive<{integer}> : rayon::iter::IntoParallelIterator`

See also the rayon documentation for ranges.

I hope this can be fixed or at least added to the "Known Problems" section for this lint, which is currently empty.

[jonasbb]

I failed to find the already existing issue #3307 on that :(