False positive for SC2154 when dereferencing an associative array inside arithmetic evaluation command

[ngkz]

For bugs

• Rule Id (if any, e.g. SC1000): SC2154
• My shellcheck version (shellcheck --version or "online"): 0.4.7
• I tried on shellcheck.net and verified that this is still a problem on the latest commit
• It's not reproducible on shellcheck.net, but I think that's because it's an OS, configuration or encoding issue

For new checks and feature suggestions

• shellcheck.net (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

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

#!/bin/bash
declare -A test
(( test[foo] ))

Here's what shellcheck currently says:

$ shellcheck myscript
 
Line 3:
(( test[foo] ))
        ^-- SC2154: foo is referenced but not assigned.

$ 

Here's what I wanted or expected to see:

No output

[koalaman]

Well caught. Thanks!