%% Test case for handling leading signs.
%mode init
B2=-3
B4=-4*5
B5=-2*-3
B6=+4
B7=+4+6
A2=-B2
A3=A2*-B7
A4=+B5+B6
%calc
%mode result
B2=-3
B4=-20
B5=6
B6=4
B7=10
A2=3
A3=-30
A4=10
%check