Intel compiler 2018 error : No instance of function template matches the specified type

Question

I'm trying the new Intel compiler 2018 a unlike every other compiler I have here this piece of code fails:

template<int power> double msqrT(double a) { return mpow(a, (double)power); };
template<> double msqrT<2>(double a) { return a*a; };
template<> double msqrT<3>(double a) { return a*a*a; };
template<> double msqrT<4>(double a) { return a*a*a*a; };

double x = msqrT<2>(y); 

For every specialization of the template it ends up with:

error : no instance of function template "msqrT" matches the specified type

Any idea why?