This once again does NOT compile. I've done work on macros; they don't work yet..

unit-tests/recursion.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+expected='nil 3,628,800'
+output=`target/psse <<EOF
+(progn
+  (set! fact
+    (lambda (n)
+      (cond ((= n 1) 1)
+        (t (* n (fact (- n 1)))))))
+  nil)
+(fact 10)
+EOF`
+actual=`echo $output | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi