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// PR c++/61745
template <typename INT,INT P> class Zp;
template <typename INT,INT P>
Zp<INT,P> operator-(const Zp<INT,P>& a, const Zp<INT,P>& b);
template <typename INT,INT P>
class Zp {
public:
static const INT p = P;
private:
INT val;
public:
Zp() : val(0) {}
Zp( INT x ) : val(x%p) { if (x < 0 ) x+= p; }
// this compiles only if the following definition is moved
// AFTER the friend declaration
Zp operator-() const { return Zp(p-val); }
friend Zp<INT,P> operator- <>(const Zp<INT,P>& a, const Zp<INT,P>& b); // { dg-error "declaration|expected" }
};
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