abstract class $IS_NIL |
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**** | Subtypes of this define "is_nil:BOOL". Typically used in typecases. Example: INT < $IS_NIL. |
$NIL | $NUMBER{_} | FLT | INT | FLTD |
is_nil:BOOL; |
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**** | Test whether a value is nil. This is necessary for types with unusual is_eq behavior (such as IEEE floats). |