quads: FAILED tests/misc/quads.pl:97
   ?- member(X,[1,2]).
   expected: X=1;X=99
quads: FAILED tests/misc/quads.pl:103
   ?- X=1.
   expected: X=1,unexpected
quads: FAILED tests/misc/quads.pl:108
   ?- X=f(Y,Z),Y=Z.
   expected: X=f(Y,Y)
quads: FAILED member_2, tests/misc/quads.pl:126
   ?- member(X,[1,2]).
   expected: X=1;X=99
quads: FAILED ball_1, tests/misc/quads.pl:148
   ?- throw(error(_A,_B)).
   expected: error(X,X)
quads: FAILED ball_2, tests/misc/quads.pl:154
   ?- throw(f(A,A)).
   expected: throw(f(X,Y))
quads: FAILED ball_3, tests/misc/quads.pl:160
   ?- throw(f(X)).
   expected: throw(f(X))
quads: FAILED ball_4, tests/misc/quads.pl:163
   ?- throw(error(type_error(atom,[X,Y]),[])).
   expected: type_error(atom,[X,X])
quads: FAILED outputs_4, tests/misc/quads.pl:208
   ?- write(abc),nl.
   expected: outputs([n,o,p,e]),true
quads: FAILED ellipsis_3, tests/misc/quads.pl:222
   ?- X=1.
   expected: X=f(...)
quads: FAILED more_3, tests/misc/quads.pl:237
   ?- member(X,[1,2,3]).
   expected: X=9, ...
quads: MALFORMED hand_1, hand-written.pl:1
   ?- X=1.
   not an answer: 1=X
quads: MALFORMED hand_2, hand-written.pl:2
   ?- Y=1.
   not an answer: Y=2
quads: MALFORMED hand_4, hand-written.pl:4
   ?- V=f(W),W=1.
   not an answer: V=f(W)
quads: 54 run, 40 passed, 14 failed.