abstract class $IS_NIL
****
Subtypes of this define "is_nil:BOOL". Typically used in typecases. Example: INT < $IS_NIL.


Descendants
$NIL $NFE{_} $NUMBER{_} $REAL_NUMBER{_}
FLT FLTD INT $CPX_NUMBER{_,_}
CPXD CPX CPX{_}



Public


Features
is_nil:BOOL;
**** Test whether a value is nil. This is necessary for types with unusual is_eq behavior (such as IEEE floats).

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