#!/bin/bash
function foo
{
	echo "A"
	declare -r vconst="I am fixed."
	echo "B"
	declare vconst="new value"
	echo "C"
	unset vconst
	echo "D"
	vconst="new value"
	echo "E"
}

function bar
{
	echo "before foo"
	foo
	echo "after foo"
}

function buzz
{
	echo "before bar"
	bar
	echo "after bar"
}

foo
bar
buzz
echo "the last line"