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============
Preprocessor
============

#if (WINDOWS || MACOSX)
int x = 0;
#elif SOLARIS
int x = 1;
#else
int x = 2;
#endif

---
(source_file
 (if_directive
  (identifier)
  (identifier))
 (namespace_member
  (field_declaration
   (type
    (symbol
     (identifier)))
   (identifier)
   (literal
    (integer))))
 (elif_directive
  (identifier))
 (namespace_member
  (field_declaration
   (type
    (symbol
     (identifier)))
   (identifier)
   (literal
    (integer))))
 (else_directive)
 (namespace_member
  (field_declaration
   (type
    (symbol
     (identifier)))
   (identifier)
   (literal
    (integer))))
(endif_directive))