SWI-Prolog -- library(prologtrace)

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library(prologtrace)

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    - Library predicates
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F.2.41 library(prologtrace)

list_tracing/0	List predicates we are currently tracing.
notraceall/0	Remove all trace points.
trace/1	Print passes through _ports_ of specified predicates.
trace/2	Print passes through _ports_ of specified predicates.
tracing/2	True if Spec is traced using Ports.