busybox/shell/ash_test/ash-misc/func1.tests

f() { echo Hello; }
g () { echo One: $# Param1: $1; }
h ( )
{
    echo -n 'Multi ' && echo -n 'line '
    echo function
    false
}

f
echo Zero: $?
set -- Restored
{ g World; }
echo Zero: $? Param1: $1
( h )
echo One: $?