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Removes from the database all clauses whose heads match Head
- Atom, variable or compound term.
This built-in predicate is obsolete!
An obsolete synonym for retractall/1.
Modes and Determinism
This predicate is sensitive to its module context (tool predicate, see @/2).
- (4) instantiation fault
- Head is not instantiated
- (5) type error
- Head is not a callable term
- (63) procedure not dynamic
- Procedure is not dynamic
- (70) accessing an undefined dynamic procedure
- Procedure is undefined
retractall / 1