nounset option: Error message points to the wrong variable when accessing associative arrays

[Baumann, Moritz]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-musl
Compiler: gcc
Compilation CFLAGS: -Os -Wformat -Werror=format-security -Werror=int-conversion 
-DSYS_BASHRC='/etc/bash/bashrc' -g
uname output: Linux 9c586e87b370 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri 
Jan 27 02:56:13 UTC 2023 x86_64 Linux
Machine Type: x86_64-alpine-linux-musl

Bash Version: 5.2
Patch Level: 15
Release Status: release

Description:
        When the nounset option is set, and you try to access a key of an
        associative array that does not exist, the error message complains
        about the key being unbound instead of the array variable.

Repeat-By:
        set -u
        declare -r -A myarray=( [foo]='bar' )
        # typo in name of the associative array
        echo ${my_array[foo]}

        Expected output: bash: my_array: unbound variable
        Actual output: bash: foo: unbound variable