ERR trap inheritance in command substitution

[Stefan Götz]

Hi!

It seems that in bash version 4.0.33(1)-release (i486-pc-linux-gnu) (from Ubuntu
9.04), ERR traps are not inherited by functions that are called via command
substitution. I expected inheritance to apply in this case since the
documentation of 'set -E' promises inheritance of the ERR trap for subshell
contexts. The script below illustrates this behavior as the trap action
err_handler() is not called.

Is this behaviour intended? Even if so, I'd like to say that I would find ERR
trap inheritance for command substitution extremely useful :-)

Cheers,
        Stefan

#!/bin/bash

err_handler() {
  echo "THERE WAS AN ERROR"
}

set -E
trap 'err_handler' ERR

myfunc() {
  false # fails to cause an ERR trap
  true
}

FOO=$(myfunc)
exit 0

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