43   struct apply {  struct
44     using type = typename F::Result;
53   struct apply {  struct
54     struct type {
56       struct apply {  struct
57         using type = F(Comp, Args...);
65   struct apply {  struct
66     struct type {
78   struct apply {  struct
79     struct type {
81       struct apply {  struct
82         using Op1 = F1(Comp);
83         using Op2 = F2(GetResult(Op1));
84         struct Op {
94         using type = PropagateError(Op1, PropagateError(Op2, Op));
104   struct apply {  struct
105     using type = Fold(Compose2ComponentFunctors, ComponentFunctorIdentity, Functors...);
117   struct apply {  struct
118     using type = ComponentFunctorIdentity;