%%% list all fact Predicates having an Argument as any argument.

argument_predicates(Argument, Predicates) :-
  findall(Predicate, (
    predicate_property(M:Clause, file(_)),  % list all predicates
    \+ M = system,                          % exclude 'system' Module, or you can constrain it to M = user
    clause(Clause, true),                   % is Clause a fact?, ie. Body = true.
    arg(_, Clause, Argument),               % Clause has the Argument as an argument (change _ to 1 if Argument has to be the first argument of a predicate).
    current_predicate(Predicate, Clause),   % extract Predicate from Clause (another way: functor(Clause,Predicate,_))
    \+ Predicate = ignore                   % exclude 'ignore' predicate since it succeeds for anything.
  ), Predicates).

upper_letter(0'A).
upper_letter(0'B).
upper_letter(0'C).

lower_letter(0'a).
lower_letter(0'b).
lower_letter(0'c).

% ?- argument_predicates(0'A, P).
% P = [upper_letter].
%
% ?- argument_predicates(0'a, P).
% P = [lower_letter].
%

my(b).
my(a).
another(a).
andAnother(a,b).
my2(c).
test(X) :- my(X).
my3(c,b,a).

% ?- argument_predicates(a, P).
% P = [andAnother, another, my, my3]
%
% ?- argument_predicates(b, P).
% P = [andAnother, my, my3].
%
% ?- argument_predicates(c, P).
% P = [my3, my2].
%