SC1087 misapplied with declare -n

[keyandthegate]

For bugs

• Rule Id (if any, e.g. SC1000): SC1087

• My shellcheck version (shellcheck --version or "online"): 0.7.1

• The rule's wiki page does not already cover this (e.g. https://shellcheck.net/wiki/SC2086)

• I tried on https://www.shellcheck.net/ and verified that this is still a problem on the latest commit

• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

SC1087 check does not allow dynamic variables #640 is related but this seems more reasonable as an exception when using declare -n.

Here's a snippet or screenshot that shows the problem:

#!/bin/bash

declare -A array=()
# shellcheck disable=SC2034 # Used through declare -n
array[key]=value
variable_name=array
declare -n variable="$variable_name[key]"
echo "$variable"

Here's what shellcheck currently says:

Line 7:
declare -n variable="$variable_name[key]"
                     ^-- SC1087 (error): Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet).

Here's what I wanted or expected to see:

No error.