prolog_code:is_control_goal/1

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Predicate is_control_goal/1

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swipl
- library

is_control_goal(@Goal): True if Goal is a compiled Prolog control structure. The difference between control structures and meta-predicates is rather unclear. The constructs below are recognised by the compiler and cannot be redefined. Note that (if->then;else) is recognised as ((if->then);else).