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/*! ```compile_fail,E0599
use rayon::prelude::*;
// zip requires data of exact size, but filter yields only bounded
// size, so check that we cannot apply it.
let a: Vec<usize> = (0..1024).collect();
let mut v = vec![];
a.par_iter()
.filter_map(|&x| Some(x as f32))
.collect_into_vec(&mut v); //~ ERROR no method
``` */