What is the goal of #If0-ed CPP tokens ?

[Ruslan Shevchenko]

File 
gcc/cpplib.h conatins follow definition:

enum cpp_token {
  CPP_EOF = -1,
  CPP_OTHER = 0,
  CPP_COMMENT = 1,
  CPP_HSPACE,
  CPP_VSPACE, /* newlines and #line directives */
  CPP_NAME,
  CPP_NUMBER,
  CPP_CHAR,
  CPP_STRING,
  CPP_DIRECTIVE,
  CPP_LPAREN,   /* "(" */
  CPP_RPAREN,   /* ")" */
  CPP_LBRACE,   /* "{" */
  CPP_RBRACE,   /* "}" */
  CPP_COMMA,    /* "," */
  CPP_SEMICOLON,/* ";" */
  CPP_3DOTS,    /* "..." */
#if 0
  CPP_ANDAND, /* "&&" */
  CPP_OROR,   /* "||" */
  CPP_LSH,    /* "<<" */
  CPP_RSH,    /* ">>" */
  CPP_EQL,    /* "==" */
  CPP_NEQ,    /* "!=" */
  CPP_LEQ,    /* "<=" */
  CPP_GEQ,    /* ">=" */
  CPP_PLPL,   /* "++" */
  CPP_MINMIN, /* "--" */
#endif
  /* POP_TOKEN is returned when we've popped a cpp_buffer. */
  CPP_POP
};


 What is the goal of text, in block #if 0 ... #endif ?


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