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#[cfg(feature = "fold")]
pub(crate) mod fold {
use crate::punctuated::{Pair, Punctuated};
pub(crate) trait FoldHelper {
type Item;
fn lift<F>(self, f: F) -> Self
where
F: FnMut(Self::Item) -> Self::Item;
}
impl<T> FoldHelper for Vec<T> {
type Item = T;
fn lift<F>(self, f: F) -> Self
where
F: FnMut(Self::Item) -> Self::Item,
{
self.into_iter().map(f).collect()
}
}
impl<T, U> FoldHelper for Punctuated<T, U> {
type Item = T;
fn lift<F>(self, mut f: F) -> Self
where
F: FnMut(Self::Item) -> Self::Item,
{
self.into_pairs()
.map(Pair::into_tuple)
.map(|(t, u)| Pair::new(f(t), u))
.collect()
}
}
}