menu_book Course Curriculum (Prolog) expand_more
use_module
Learn use_module in Prolog through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.
use_module is an atomic Prolog topic inside Dynamic & Modules. This lesson focuses on how the use_module construct is written, what it changes, and when it is the right tool.
Trace the example line by line. Identify the exact syntax for use_module, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.
Topic-specific example
:- use_module(library(lists)).
has_duplicate(L) :- msort(L,S), append(_, [X,X|_], S).For use_module, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.