145 struct return_type_2_ifthenelsereturn;
149 struct return_type_2_ifthenelsereturn<Phase, true, true, false, A, B> {  struct
151     detail::return_type_deduction_failure<return_type_2_ifthenelsereturn> type;  argument
156 struct return_type_2_ifthenelsereturn<Phase, true, true, true, A, B> {  struct
163 struct return_type_2_ifthenelsereturn<Phase, true, false, false, A, B> {  struct
169 struct return_type_2_ifthenelsereturn<Phase, false, true, false, A, B> {  struct
176 struct return_type_2_ifthenelsereturn<1, false, false, false, A, B> {  struct
185        return_type_2_ifthenelsereturn<
196 struct return_type_2_ifthenelsereturn<2, false, false, false, A, B> {  struct
198     detail::return_type_deduction_failure<return_type_2_ifthenelsereturn> type;  argument
208     return_type_2_ifthenelsereturn<