1 #![feature(type_alias_impl_trait)]
4 type BitsIter: Iterator<Item = u8>;
5 fn iter_bits(self, n: u8) -> Self::BitsIter;
8 type IterBitsIter<T, E, I> = impl std::iter::Iterator<Item = I>;
10 impl<T: Copy, E> IterBits for T
12 T: std::ops::Shr<Output = T>
13 + std::ops::BitAnd<T, Output = T>
14 + std::convert::From<u8>
15 + std::convert::TryInto<u8, Error = E>,
18 type BitsIter = IterBitsIter<T, E, u8>;
19 fn iter_bits(self, n: u8) -> Self::BitsIter {
20 //~^ ERROR non-defining opaque type use in defining scope
21 (0u8..n).rev().map(move |shift| ((self >> T::from(shift)) & T::from(1)).try_into().unwrap())