on MacOSX 10.4.11 Erlang (BEAM) emulator version 5.6.1 [source] [smp:2] [async-threads: 0] [kernel-poll:false] Eshell V5.6.1 (abort with ^G) 1> [X, Y || {X, Y} <- []]. * 1: syntax error before: '||' 1>