public static bool Is7 <T1, T2, T3, T4, T5, T6, T7, T8>(this IOrType <T1, T2, T3, T4, T5, T6, T7, T8> self, out T7 t7)
{
if (self.Possibly7() is IIsDefinately <T7> definate)
{
t7 = definate.Value;
return(true);
}
t7 = default;
return(false);
}