SWI-Prolog -- xref

Availability::- use_module(library(prolog_xref)).(can be autoloaded)

Callable is defined in Source. How is one of

`dynamic(Line)`	Declared dynamic at `Line`
`thread_local(Line)`	Declared thread local at `Line`
`multifile(Line)`	Declared multifile at `Line`
`local(Line)`	First clause at `Line`
`foreign(Line)`	Foreign library loaded at `Line`
`constraint(Line)`	CHR Constraint at `Line`
`imported(File)`	Imported from `File`