Hi, I wonder whether such difference in "trap" behavior is valid:
$ sh -c 'f() { echo f; }; t() { trap f EXIT; trap; }; t'
trap -- 'f' EXIT
f
$ sh -c 'f() { echo f; }; t() { trap f EXIT; trap; }; t&'
trap -- 'f' EXIT
$ sh -c 'f() { echo f; }; t() { trap f EXIT; trap; }; (t)&'
trap -- 'f' EXIT
f
Other shells (e.g. dash, zsh) demonstrate no such difference:
$ ash -c 'f() { echo f; }; t() { trap f EXIT; trap; }; t'
trap -- 'f' EXIT
f
$ ash -c 'f() { echo f; }; t() { trap f EXIT; trap; }; t&'
trap -- 'f' EXIT
f
$ ash -c 'f() { echo f; }; t() { trap f EXIT; trap; }; (t)&'
trap -- 'f' EXIT
f
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