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

unit-tests/try.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+result=0
+
+echo -n "$0: if the body of a try errors, the last form in the catch block is returned... "
+expected=':foo'
+actual=`echo "(try ((+ 2 (/ 1 'a))) (:foo))" | target/psse 2>&1 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    return=`echo "${return} + 1" | bc`
+fi
+
+echo -n "$0: if the body of a try errors, the last form in the catch block is evaluated... "
+
+expected='4'
+actual=`echo "(try ((+ 2 (/ 1 'a))) ((+ 2 2)))" | target/psse 2>&1 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    return=`echo "${return} + 1" | bc`
+fi
+
+echo -n "$0: body and catch block can optionally be marked with keywords... "
+expected='8'
+actual=`echo "(try (:body (+ 2 (/ 1 'a))) (:catch (* 2 2 2)))" | target/psse 2>&1 | tail -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    return=`echo "${return} + 1" | bc`
+fi
+
+echo -n "$0: the exception is bound to the symbol \`*exception*\` in the catch environment... "
+expected='Exception: ((:location . /) (:payload . "Cannot divide: not a number"))'
+actual=`echo "(try (:body (+ 2 (/ 1 'a))) (:catch *exception*))" | target/psse 2>&1 | grep Exception`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    return=`echo "${return} + 1" | bc`
+fi
+
+exit ${result}