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==Implementation== The Prolog subset of Poplog is implemented using the extendable [[incremental compiler]] of [[POP-11]], the core language of Poplog, which is a general purpose Lisp-like language with a more conventional syntax. The implementation required the Poplog Virtual Machine to be extended to provide support for Prolog [[continuation]]s, Prolog variables, the Prolog ''trail'' (recording undoable variable bindings), and Prolog terms. The implementation was constrained by the need to allow data-structures to be shared with the other Poplog languages, especially [[POP-11]] and [[Common Lisp]], thereby providing support for a mixture of programming styles.
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