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a() {
(exit 2)
echo a:$?
(kill -s USR1 $$; echo b:$?; exit 3)
echo c:$? # does not execute
(exit 4)
}
trap "echo Trap; return" USR1
a
echo d:$?
# It's debatable what is the correct value above.
# Does 'return' in trap see $? == 2 or $? == 3?
# IOW: after (kill..), does shell first wait for its completion
# and sets $?, then checks pending signals and runs a trap handler,
# or does it first check pending signals and runs handler?
# hush does the former, and prints 3.
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