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/*! ```compile_fail,E0599

// Check that we can't use the par-iter API to access contents of an
// `Rc`.

use rayon::prelude::*;
use std::rc::Rc;

fn main() {
    let x = vec![Rc::new(22), Rc::new(23)];
    let mut y = vec![];
    x.into_par_iter() //~ ERROR no method named `into_par_iter`
     .map(|rc| *rc)
     .collect_into_vec(&mut y);
}

``` */