Wed, 21 Dec 2016 16:22:23 +0100 wenzelm more explicit error;
Wed, 21 Dec 2016 16:14:47 +0100 wenzelm more explicit error;
Wed, 21 Dec 2016 16:02:52 +0100 wenzelm display messages, according to regular Isabelle Output;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 tip