/* n_6.t:   #include directive. */

/* 6.1: Header-name quoted by " and " as well as by < and > can include

        standard headers.   */

/* Note: Standard headers can be included any times.    */

#include    "ctype.h"

#include    <ctype.h>

/* 6.2: Macro is allowed in #include line.  */

#define HEADER  "header.h"

/* Before file inclusion:   #include "header.h" */

#include    HEADER

/*  abc */

    MACRO_abc

/* 6.3: With macro nonsence but legal.  */

#undef  MACRO_abc

#define ZERO_TOKEN

#include    ZERO_TOKEN HEADER ZERO_TOKEN

/*  abc */

    MACRO_abc