Nameref (local -n / typeset -n) not implemented

[chaliy]

Description

Bash namerefs (local -n, typeset -n, declare -n) are not implemented. All 14 nameref tests are skipped.

Scope

• local -n ref=var - create a nameref local variable
• typeset -n ref / typeset +n ref - toggle nameref attribute
• declare -n ref=var - declare nameref
• Reading through nameref: echo $ref should dereference
• Writing through nameref: ref=value should modify target
• ${!ref} with namerefs - inverted behavior (shows target name instead of dereferencing)
• Nameref chains: ref1 -> ref2 -> var
• Nameref to array elements: ref='arr[2]'
• Nameref via dynamic scoping in functions
• unset ref should unset the target, not the ref

Repro

x=hello
declare -n ref=x
echo $ref
# bashkit outputs: x (wrong, should dereference to: hello)

ref=world
echo $x
# bashkit outputs: hello (wrong, should be: world — mutation through ref)

local -n arr_ref=myarr
myarr=(a b c)
echo ${arr_ref[1]}
# bashkit outputs: (empty) (wrong, should be: b)

Test coverage

14 skipped tests in crates/bashkit/tests/spec_cases/bash/nameref.test.sh (PR #351).

Oils reference: https://github.com/oilshell/oil/blob/master/spec/nameref.test.sh