/*! ```compile_fail,E0277
use rayon::prelude::*;
// zip requires data of exact size, but filter yields only bounded
// size, so check that we cannot apply it.
let mut a: Vec<usize> = (0..1024).rev().collect();
let b: Vec<usize> = (0..1024).collect();
a.par_iter()
.zip(b.par_iter().filter(|&&x| x > 3)); //~ ERROR
``` */