============================================
Include directives
============================================

#include "some/path.h"
#include <stdint.h>

---

(translation_unit
  (preproc_include (string_literal))
  (preproc_include (system_lib_string)))

============================================
Defines
============================================

#define SIZE 1024

#define SOMETHING \
  x + \
  y

---

(translation_unit
  (preproc_define (identifier))
  (preproc_define (identifier)))

============================================
Ifdefs
============================================

#ifndef SOMETHING
int x;
#endif

#ifdef SOMETHING_ELSE
#else
#endif

---

(translation_unit
  (preproc_ifndef (identifier))
  (declaration (identifier) (identifier))
  (preproc_endif)
  (preproc_ifdef (identifier))
  (preproc_else)
  (preproc_endif))