<PackageReference Include="System.Reactive" Version="4.0.0-preview.3.build.380" />

ActivePlan<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>

class ActivePlan<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15> : ActivePlan