Calling `listing` from the top-level

Hi,

currently, `listing/0` at the top level has a whole bunch of output. Random
excerpt:

---
prolog_file_type(qlf, qlf).
prolog_file_type(A, executable) :-
    system:current_prolog_flag(shared_object_extension, A).

:- dynamic library_directory/1.
:- multifile library_directory/1.

library_directory(B) :-
    '$parms':
    (   cached_library_directory(local, A=lib, A),
    B=A
    ).
---


Is that meant to be there? Did I mess up my installation somehow?

Cheers,
Boris
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