BASH_SUBSHELL reset to 0 on EXIT trap in aubshell

[Martijn Dekker]

bash resets BASH_SUBSHELL to 0 when executing an EXIT trap, even if the
EXIT trap is executed in a subshell.

echo $(trap 'echo $BASH_SUBSHELL' EXIT; echo $BASH_SUBSHELL)
Actual output: 1 0
Expected output: 1 1

The same does not happen for a signal trap.

echo $(trap 'echo $BASH_SUBSHELL; exit' INT; echo $BASH_SUBSHELL;
       kill -s INT $BASHPID)
Actual output: 1 1
Expected output: 1 1

Thanks,

- Martijn