ref: 1c8789198373a52da9e80dc9b2b1ee2b67af61c4
dir: /example.pl/
:- module(example, []).
math(A,B,C,D) :- D is A + B + C * A.
parentest :-
1 + 2 * 3 + 4.
parentest :-
(0 * (1 + 2) * 3) * 3 + 4.
likes(bob, ice).
likes(sam, text).
likes(sam, ice).
could_be_friends(Person1, Person2) :-
likes(Person1, Thing1),
likes(Person2, Thing2),
Thing1 = Thing2.
list1(A) :- A = [1,2,3,4].
list2(A) :- A = [a,b|c].
curly(A) :- A = {one,two,three}.
tester(A, B) :- !, A = B.
tester(A, B) :- true.
thrower(_, 10).
thrower(_, 20).
thrower(inner, _) :- throw(number(30)).
thrower(outer, _) :- throw(hehe).
thrower(_, 100).
throwtest(Type, L) :-
catch(
catch((thrower(Type, N), L=N), number(N), L=N),
Other,
L=outer_exception(Other)
).