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Showing content from https://cplusplus.github.io/LWG/issue4103 below:

unique_copy's constraints for the case where result is an input_iterator are not quite right

template<input_iterator I, sentinel_for<I> S, weakly_incrementable O, class Proj = identity,
         indirect_equivalence_relation<projected<I, Proj>> C = ranges::equal_to>
  requires indirectly_copyable<I, O> &&
           (forward_iterator<I> ||
            (input_iterator<O> && same_as<iter_value_t<I>, iter_value_t<O>>
             indirect_equivalence_relation<C, projected<I, Proj>, projected<O, Proj>>) ||
            indirectly_copyable_storable<I, O>)
  constexpr ranges::unique_copy_result<I, O>
    ranges::unique_copy(I first, S last, O result, C comp = {}, Proj proj = {});
template<input_range R, weakly_incrementable O, class Proj = identity,
         indirect_equivalence_relation<projected<iterator_t<R>, Proj>> C = ranges::equal_to>
  requires indirectly_copyable<iterator_t<R>, O> &&
           (forward_iterator<iterator_t<R>> ||
           (input_iterator<O> && same_as<range_value_t<R>, iter_value_t<O>>
            indirect_equivalence_relation<C, projected<iterator_t<R>, Proj>,
                                             projected<O, Proj>>) ||
            indirectly_copyable_storable<iterator_t<R>, O>)
  constexpr ranges::unique_copy_result<borrowed_iterator_t<R>, O>
    ranges::unique_copy(R&& r, O result, C comp = {}, Proj proj = {});

-6- Let pred be equal_to{} for the overloads in namespace std with no parameter pred, […]

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