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// { dg-do compile }

// { dg-options "-O2" }

typedef __complex__ double Value;

struct LorentzVector

{

  LorentzVector & operator+=(const LorentzVector & a) {

    theX += a.theX;

    theY += a.theY;

    theZ += a.theZ;

    theT += a.theT;

    return *this;

  }

  Value theX;

  Value theY;

  Value theZ;

  Value theT;

};

inline LorentzVector

operator+(LorentzVector a, const LorentzVector & b) {

  return a += b;

}

Value ex, et;

LorentzVector sum() {

  LorentzVector v1; v1.theX =ex; v1.theY =ex+et; v1.theZ =ex-et;   v1.theT =et;

  return v1+v1;

}