All unit tests passing! This is slightly a fix because there is a bug with

the character read after reading a number not being correctly pushed back
onto the input stream, but...

unit-tests/complex-list.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+expected='(1 2 3 ("Fred") NIL 77354)'
+actual=`echo '(1 2 3 ("Fred") () 77354 )' | target/psse 2> /dev/null`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi