Trying A <- 2+2.
in the little window on the right bottom, I get:
Unknown error term: sisocks_error(-1,'connection refused')
In:
[6] r_open(_1624,[host('/home/rserve/socket'),...])
[5] rserve:r_open_hook($,_1690) at /scratch/swish/src/swish/pack/rserve_client/prolog/r/r_call.pl:373
[4] <meta call>
[3] r_eval($,"options(width=105)",_1742) <foreign>
[1] r_call:r_execute([],[50,32|...],_1802) at /scratch/swish/src/swish/pack/rserve_client/prolog/r/r_call.pl:235
Note: some frames are missing due to last-call optimization.
Re-run your program in debug mode (:- debug.) to get more detail.