39 constexpr auto singleton(X x) {  in singleton()  function
90         { return singleton(x); }  in apply()
171             hana::union_(singleton(c<0>), singleton(c<0>)),  in main()
172             singleton(c<0>)  in main()
175             hana::union_(singleton(c<0>), singleton(c<1>)),  in main()
179             hana::union_(singleton(c<0>), doubleton(c<0>, c<1>)),  in main()
188             BOOST_HANA_CONSTEXPR_CHECK(hana::equal(singleton(n<0>), singleton(n<0>)));  in main()
189             BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), singleton(n<1>))));  in main()
191             BOOST_HANA_CONSTEXPR_CHECK(hana::equal(singleton(n<0>), doubleton(n<0>, n<0>)));  in main()
192 …       BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), doubleton(n<0>, n<1>))));  in main()
193 …       BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::equal(singleton(n<0>), doubleton(n<1>, n<1>))));  in main()
207                 hana::transform(singleton(n<0>), f),  in main()
208                 singleton(f(n<0>))  in main()
216                 singleton(f(n<0>))  in main()
226                 hana::ap(singleton(f), singleton(c<0>)),  in main()
227                 singleton(f(c<0>))  in main()
230                 hana::ap(singleton(f), doubleton(c<0>, c<1>)),  in main()
235                 hana::ap(doubleton(f, g), singleton(c<0>)),  in main()
249                 singleton(c<0>)  in main()
259                 hana::flatten(singleton(singleton(c<0>))),  in main()
260                 singleton(c<0>)  in main()
263                 hana::flatten(singleton(doubleton(c<0>, c<1>))),  in main()
268                 hana::flatten(doubleton(singleton(c<0>), singleton(c<1>))),  in main()
272                 hana::flatten(doubleton(doubleton(c<0>, c<1>), singleton(c<2>))),  in main()
273                 hana::union_(doubleton(c<0>, c<1>), singleton(c<2>))  in main()
276                 hana::flatten(doubleton(singleton(c<0>), doubleton(c<1>, c<2>))),  in main()
277                 hana::union_(doubleton(c<0>, c<1>), singleton(c<2>))  in main()
290             BOOST_HANA_CONSTEXPR_CHECK(hana::any_of(singleton(n<0>), hana::equal.to(n<0>)));  in main()
291 …       BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::any_of(singleton(n<0>), hana::equal.to(n<1>))));  in main()
299 …BOOST_HANA_CONSTANT_CHECK(hana::find_if(singleton(c<0>), hana::equal.to(c<0>)) == hana::just(c<0>)…  in main()
300 …  BOOST_HANA_CONSTANT_CHECK(hana::find_if(singleton(c<1>), hana::equal.to(c<0>)) == hana::nothing);  in main()
309             BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<0>), singleton(n<0>)));  in main()
310 …         BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(singleton(n<1>), singleton(n<0>))));  in main()
312             BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<0>), doubleton(n<0>, n<1>)));  in main()
313             BOOST_HANA_CONSTEXPR_CHECK(hana::is_subset(singleton(n<1>), doubleton(n<0>, n<1>)));  in main()
314 …   BOOST_HANA_CONSTEXPR_CHECK(hana::not_(hana::is_subset(singleton(n<2>), doubleton(n<0>, n<1>))));  in main()