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#![feature(type_alias_impl_trait)]
trait IterBits {
type BitsIter: Iterator<Item = u8>;
fn iter_bits(self, n: u8) -> Self::BitsIter;
}
type IterBitsIter<T, E, I> = impl std::iter::Iterator<Item = I>;
impl<T: Copy, E> IterBits for T
where
T: std::ops::Shr<Output = T>
+ std::ops::BitAnd<T, Output = T>
+ std::convert::From<u8>
+ std::convert::TryInto<u8, Error = E>,
E: std::fmt::Debug,
{
type BitsIter = IterBitsIter<T, E, u8>;
#[define_opaque(IterBitsIter)]
fn iter_bits(self, n: u8) -> Self::BitsIter {
(0u8..n).rev().map(move |shift| ((self >> T::from(shift)) & T::from(1)).try_into().unwrap())
//~^ ERROR expected generic type parameter, found `u8`
}
}
fn main() {}
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