template5.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

// Build don't link:

// Copyright (C) 1999 Free Software Foundation

// by Alexandre Oliva <[e-mail]>
// simplified from bug report by Andrey Slepuhin <[e-mail]>

template <typename> class X {
  template <typename> class Z;
};

X<void> a;