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#include <iostream>
#include <limits>
#include <type_traits>
 
using namespace std;
 
template <typename T>
constexpr enable_if_t<is_integral<T>::value, int[]> foo = { 1, 2 };
 
template <typename T>
constexpr enable_if_t<is_floating_point<T>::value, int[]> foo = { 10, 20, 30 };
 
 
int main() {
  cout << foo<int>[0] << endl;
}

prog.cpp:11:59: error: redeclaration of ‘template<class T> constexpr std::enable_if_t<std::is_floating_point<_Tp>::value, int []> foo’
 constexpr enable_if_t<is_floating_point<T>::value, int[]> foo = { 10, 20, 30 };
                                                           ^~~
prog.cpp:8:53: note: previous declaration ‘template<class T> constexpr std::enable_if_t<std::is_integral<_Tp>::value, int []> foo<T>’
 constexpr enable_if_t<is_integral<T>::value, int[]> foo = { 1, 2 };
                                                     ^~~

Standard output is empty