ftp.nice.ch/Attic/openStep/implementation/gnustep/sources/libobjects-0.1.19.tgz#/libobjects-0.1.19/config/config.nested.c

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/* Used by `configure' to test GCC nested functions */
int main() 
{
  int a = 2;
  void nested(int b)
    {
      a += b;
    }
  void doit(void(*f)(int)) 
    {
      (*f)(4);
    }
  doit(nested);
  if (a != 6)
    exit(-1);
  exit(0);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.