Function clear_entries

include/sol/stack.hpp:76–83

		}

		inline void clear_entries(stack_reference r) {
			stack::push(r.lua_state(), lua_nil);
			while (lua_next(r.lua_state(), -2)) {
				absolute_index key(r.lua_state(), -2);
				auto pn = stack::pop_n(r.lua_state(), 1);
				stack::set_field<false, true>(r.lua_state(), key, lua_nil, r.stack_index());
			}
		}

		inline void clear_entries(const reference& registry_reference) {
			auto pp = stack::push_pop(registry_reference);