Bash empty array expansion with `set -u`

Question

I\'m writing a bash script which has set -u, and I have a problem with empty array expansion: bash appears to treat an empty array as an unset variable during e

Answer 1

Turns out array handling has been changed in recently released (2016/09/16) bash 4.4 (available in Debian stretch, for example).

$ bash --version | head -n1
bash --version | head -n1
GNU bash, version 4.4.0(1)-release (x86_64-pc-linux-gnu)

Now empty arrays expansion does not emits warning

$ set -u
$ arr=()
$ echo "${arr[@]}"

$ # everything is fine