Can virtual functions be C++20 coroutines?

Question

The title says it all: Can virtual functions also be C++20 coroutines?

struct A {
    virtual std::generator<int> generate() const = 0; // std::generator: C++23
};

struct B : A {
    virtual std::generator<int> generate() const { ~~~~ }
};

?

Answer 1

Yes.

From cppreference

Restrictions
Coroutines cannot use variadic arguments, plain return statements, or placeholder return types (auto or Concept).
Constexpr functions, constructors, destructors, and the main function cannot be coroutines.

Knowing how they work, I don't see any reason why it wouldn't be allowed.