//User types
struct field_t{};
struct other_t{};
struct StructT{other_t field;field_t other;};
//Implementation detail
template<typename T,typename FIELD_T>
struct type_has_field{
  struct Fallback {FIELD_T field;};
  struct Derived:T,Fallback{};
  template<typename C, C> struct ChT;
  template<typename C> static char (&f(ChT<FIELD_T Fallback::*, &C::field>*))[1];
  template<typename C> static char (&f(...))[2];
 
  static bool const value = sizeof(f<Derived>(0)) == 2;
};
//Experiment
 
static_assert(
  false==type_has_field<StructT,field_t>::value,
  "field_t StructT::field - should not exist"
);
 
int main(){return 0;}

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