call_dcg/3

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- Reference manual
  - Built-in Predicates
    - DCG Grammar rules
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Availability:built-in

call_dcg(:DCGBody, ?State0, ?State)

As phrase/3, but without type checking State0 and State. This allows for using DCG rules for threading an arbitrary state variable. This predicate was introduced after type checking was added to phrase/3.^{79After
discussion with Samer Abdallah.}

A portable solution for threading state through a DCG can be implemented by wrapping the state in a list and use the DCG semicontext facility. Subsequently, the following predicates may be used to access and modify the state:^{80This
solution was proposed by Markus Triska.}

state(S), [S] --> [S].
state(S0, S), [S] --> [S0].