Spot the Conflicting Template Arguments

1#include <iostream>
2 
3template <typename T>
4T add(T first, T second) {
5    return first + second;
6}
7 
8int main() {
9    std::cout << add(2, 3) << "\n";
10    std::cout << add(2.0, 3.0) << "\n";
11    // std::cout << add(2, 3.5) << "\n";   // does NOT compile: T would be int from 2 and double from 3.5
12    std::cout << add<double>(2, 3.5) << "\n";
13    std::cout << add<int>(2, 3) << "\n";
14    return 0;
15}