abstract class $IS_NIL


Descendants
$NIL RAT RECTANGLE TOKEN
$VALUE{_} $ORDERED{_} ANGLE ELAPSED
ORDER_WEIGHT TIME_STAMP ANGLED UNICODE
TIMES CHAR_CODE $DATES{_} DATES
ERA_DATES $NFE{_} MONEY $ARITHMETIC{_}
$COMPLEX{_,_} CPXD CPX $RATIONAL{_}
$REAL{_} FLTD FLT $SIMPLE_NUM{_}
$WHOLE_NUM{_} INTI $CARDINAL{_} $INTEGER{_}
INT FIELD CARD $CHAR{_}
CHAR RUNE $STRINGS $FSTRINGS
$FSTRING{_} FBINSTR $FTEXT_STRING{_} $FTEXT_STRING{_,_,_}
FSTR FRUNES $SEARCH{_,_} $TEXT_STRING{_,_,_}
STR OCT_STR HEX_STR RUNES
$STRING{_,_,_} BINSTR QUAD_STR $STRING{_}
$TEXT_STRING{_} $ENUMS{_} NAME_CODES VERSION_KEYS
MONETARY_UNITS ADDRESS_KEYS FILE_LOCS FILE_MODES
DATE_SUFFICES FLUSH_CMDS NUM_SIGNS SCRIPTS
ERE_LEX_TOKENS MAP_MODES CAT_STANDARDS CATEGORIES
CHAR_CLASS INFO_KINDS TRI_STATE SALUTATIONS
UNIT_KINDS DATE_FORMS ADDRESS_CODES SYMBOLS
CODE_KINDS PATH_KINDS DT_CODES WEEKDAYS
CONVERSION_RESULTS UNITS SYS_EXCEPT MAP_PARTS
CURSOR_ERRORS CHAR_MAPPINGS PHONE_CODES SIGN_POSITIONS
CAL_DISPLAY_ORDERS MONTHS MON_SPACING SYS_CHANS
ACCESS_CODES FILE_KINDS TIME_SUFFIX DIRECTIONS
CONDITIONALS ERE_ERROR_KINDS PERMISSIONS



Public


Features
is_nil : BOOL ;

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