Here's the updated list of cases:
| r=/; declare -n r
| declare -n r=/
| declare -n r; r=/
| declare -n r; for r in /; do :; done
| declare -n r; select r in /; do :; done <<< 1; echo x; echo $r
| declare -n r; ((r=0))
| ((r=0)); declare -n r
| r=/ declare -n r
| f() { declare -n r; }; r=/ f
| f() { echo $r; }; declare -n r; r=/ f
| declare -n r; : ${r:=/}
| declare -n r; exec {r}>/dev/null
| declare -n r; coproc r { :; }; echo $r
| declare -r RO=x; r=$RO; declare -n r; x=y; declare -n RO; RO=z; declare -p
RO; echo "$RO"
| s=/; declare -n r=s; declare -n s; echo $r
| declare -n r=s; declare -n s; s=/
| declare -n r; getopts x r -h
| declare -n r; mapfile r < /dev/null
| mapfile r < /dev/null; declare -n r
| declare -n r; printf -v r /
You can set a nameref value to an invalid identifier, but what I noticed is
that it will write the error message on *expansion* and not on assignment (this
is what bash already does).
The 'mapfile' one is interesting, because it drops the nameref attribute from
the 'r' variable.
--
Eduardo Bustamante
https://dualbus.me/
