Mon, 28 Jan 2008 22:27:26 +0100 wenzelm location_of_position: Position.column_of (which counts Isabelle symbols, not characters);
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip