clang -Xclang -ast-print -fsyntax-only main.cc ＞ main-init.cc

template <int N>
struct Fib {
  enum {Value = Fib<N-1>::Value + Fib<N-2>::Value};
};

template<>
struct Fib<1> {
  enum {Value = 1};
};

template<>
struct Fib<2> {
  enum {Value = 1};
};

int main() {
  Fib<20>::Value;
  return 0;
}

main-init.cc

template <int N> struct Fib {
    enum  {
        Value = Fib<N - 1>::Value + Fib<N - 2>::Value
    };
};
template<> struct Fib<20> {
    enum  {
        Value = Fib<20 - 1>::Value + Fib<20 - 2>::Value
    };
};
template<> struct Fib<19> {
    enum  {
        Value = Fib<19 - 1>::Value + Fib<19 - 2>::Value
    };
};
template<> struct Fib<18> {
    enum  {
        Value = Fib<18 - 1>::Value + Fib<18 - 2>::Value
    };
};
template<> struct Fib<17> {
    enum  {
        Value = Fib<17 - 1>::Value + Fib<17 - 2>::Value
    };
};
template<> struct Fib<16> {
    enum  {
        Value = Fib<16 - 1>::Value + Fib<16 - 2>::Value
    };
};
template<> struct Fib<15> {
    enum  {
        Value = Fib<15 - 1>::Value + Fib<15 - 2>::Value
    };
};
template<> struct Fib<14> {
    enum  {
        Value = Fib<14 - 1>::Value + Fib<14 - 2>::Value
    };
};
template<> struct Fib<13> {
    enum  {
        Value = Fib<13 - 1>::Value + Fib<13 - 2>::Value
    };
};
template<> struct Fib<12> {
    enum  {
        Value = Fib<12 - 1>::Value + Fib<12 - 2>::Value
    };
};
template<> struct Fib<11> {
    enum  {
        Value = Fib<11 - 1>::Value + Fib<11 - 2>::Value
    };
};
template<> struct Fib<10> {
    enum  {
        Value = Fib<10 - 1>::Value + Fib<10 - 2>::Value
    };
};
template<> struct Fib<9> {
    enum  {
        Value = Fib<9 - 1>::Value + Fib<9 - 2>::Value
    };
};
template<> struct Fib<8> {
    enum  {
        Value = Fib<8 - 1>::Value + Fib<8 - 2>::Value
    };
};
template<> struct Fib<7> {
    enum  {
        Value = Fib<7 - 1>::Value + Fib<7 - 2>::Value
    };
};
template<> struct Fib<6> {
    enum  {
        Value = Fib<6 - 1>::Value + Fib<6 - 2>::Value
    };
};
template<> struct Fib<5> {
    enum  {
        Value = Fib<5 - 1>::Value + Fib<5 - 2>::Value
    };
};
template<> struct Fib<4> {
    enum  {
        Value = Fib<4 - 1>::Value + Fib<4 - 2>::Value
    };
};
template<> struct Fib<3> {
    enum  {
        Value = Fib<3 - 1>::Value + Fib<3 - 2>::Value
    };
};
template<> struct Fib<1> {
    enum  {
        Value = 1
    };
};
template<> struct Fib<2> {
    enum  {
        Value = 1
    };
};
int main() {
    Fib<20>::Value;
    return 0;
}