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// Check that we are flagged for ignoring `must_use` parallel adaptors.
// (unfortunately there's no error code for `unused_must_use`)
macro_rules! must_use {
($( $name:ident #[$expr:meta] )*) => {$(
/// First sanity check that the expression is OK.
///
/// ```
/// #![deny(unused_must_use)]
///
/// use rayon::prelude::*;
///
/// let v: Vec<_> = (0..100).map(Some).collect();
/// let _ =
#[$expr]
/// ```
///
/// Now trigger the `must_use`.
///
/// ```compile_fail
/// #![deny(unused_must_use)]
///
/// use rayon::prelude::*;
///
/// let v: Vec<_> = (0..100).map(Some).collect();
#[$expr]
/// ```
mod $name {}
)*}
}
must_use! {
step_by /** v.par_iter().step_by(2); */
chain /** v.par_iter().chain(&v); */
chunks /** v.par_iter().chunks(2); */
fold_chunks /** v.par_iter().fold_chunks(2, || 0, |x, _| x); */
fold_chunks_with /** v.par_iter().fold_chunks_with(2, 0, |x, _| x); */
cloned /** v.par_iter().cloned(); */
copied /** v.par_iter().copied(); */
enumerate /** v.par_iter().enumerate(); */
filter /** v.par_iter().filter(|_| true); */
filter_map /** v.par_iter().filter_map(|x| *x); */
flat_map /** v.par_iter().flat_map(|x| *x); */
flat_map_iter /** v.par_iter().flat_map_iter(|x| *x); */
flatten /** v.par_iter().flatten(); */
flatten_iter /** v.par_iter().flatten_iter(); */
fold /** v.par_iter().fold(|| 0, |x, _| x); */
fold_with /** v.par_iter().fold_with(0, |x, _| x); */
try_fold /** v.par_iter().try_fold(|| 0, |x, _| Some(x)); */
try_fold_with /** v.par_iter().try_fold_with(0, |x, _| Some(x)); */
inspect /** v.par_iter().inspect(|_| {}); */
interleave /** v.par_iter().interleave(&v); */
interleave_shortest /** v.par_iter().interleave_shortest(&v); */
intersperse /** v.par_iter().intersperse(&None); */
map /** v.par_iter().map(|x| x); */
map_with /** v.par_iter().map_with(0, |_, x| x); */
map_init /** v.par_iter().map_init(|| 0, |_, x| x); */
panic_fuse /** v.par_iter().panic_fuse(); */
positions /** v.par_iter().positions(|_| true); */
rev /** v.par_iter().rev(); */
skip /** v.par_iter().skip(1); */
take /** v.par_iter().take(1); */
update /** v.par_iter().update(|_| {}); */
while_some /** v.par_iter().cloned().while_some(); */
with_max_len /** v.par_iter().with_max_len(1); */
with_min_len /** v.par_iter().with_min_len(1); */
zip /** v.par_iter().zip(&v); */
zip_eq /** v.par_iter().zip_eq(&v); */
}