lineno5.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) 2001 Free Software Foundation, Inc.
// Contributed by Nathan Sidwell 25 Jul 2001 <[e-mail]>

// Origin: [e-mail]
// Bug 3621. At the end of saved input, we'd set the lineno to
// zero. This would confusing things no end, if there was a subsequent
// error.

namespace tmp {
  typedef int B;
  B b;
}

class A {
  public:
  int kaka(tmp::B = b);		// ERROR - no b in scope
};