File: pr51313.C

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gcc-arm-none-eabi 15%3A7-2018-q2-6
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// PR c++/51313
// { dg-do compile { target c++11 } }

class ostream;

extern "C" {
  extern int isdigit (int);
}

ostream&
operator<<(ostream&, const unsigned char*);

extern ostream cout;

int main()
{
  cout << isdigit(0);  // { dg-error "invalid conversion" }
}