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#![allow(unused_variables)]
use extend::ext;
use std::iter::FromIterator;
#[ext]
impl<T, K, F, C> C
where
C: IntoIterator<Item = T>,
K: Eq,
F: Fn(&T) -> K,
{
fn group_by<Out>(self, f: F) -> Out
where
Out: FromIterator<(K, Vec<T>)>,
{
todo!()
}
fn group_by_and_map_values<Out, G, T2>(self, f: F, g: G) -> Out
where
G: Fn(T) -> T2 + Copy,
Out: FromIterator<(K, Vec<T2>)>,
{
todo!()
}
fn group_by_and_return_groups(self, f: F) -> Vec<Vec<T>> {
todo!()
}
}
fn main() {}
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