SWI-Prolog -- del

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Predicate del_attr/2

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Documentation
- Reference manual
  - Constraint Logic Programming
    - Attributed variables
      - Attribute manipulation predicates
        
        attvar/1
        
        put_attr/3
        
        get_attr/3
        
        del_attr/2
- Packages

Availability:built-in

del_attr(+Var, +Module)

Delete the named attribute. If Var loses its last attribute it is transformed back into a traditional Prolog variable. If Module is not an atom, a type error is raised. In all other cases this predicate succeeds regardless of whether or not the named attribute is present.