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// { dg-do assemble  }

// Origin: Gerald Pfeifer 

#include 

struct IDENT

    {

    enum TYPE { Variable, Constant } type;

    std::ostream& printTo(std::ostream& out) const

        {

        switch (type)

            {

            case Variable:

                out << '_';

                break;

            default:

                break;

            }

        return out;

        }

    };

template 

struct TC

    {

    IDENT i;

    const IDENT& getIdent() const

        {

        return i;

        }

    };

template 

inline std::ostream& operator<< (std::ostream& out, const TC &c)

    {

    c.getIdent().printTo(out);

    return out;

    }

void foo(const TC &c)

    {

    std::cerr << c

         << ": " // This line is crucial!

         << c

         << std::endl;

    }