SC3043?: local with options is bashism

[e-kwsm]

For bugs

• Rule Id (if any, e.g. SC1000): SC3043?
• My shellcheck version (shellcheck --version or 'online'): online
• 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/dash
#shellcheck disable=SC2034
f() {
        local -r var=foo
}

Here's what shellcheck currently says:

nothing

Here's what I wanted or expected to see:

dash does not support -r and other options:

$ f() { local -r var=foo; }
$ f
dash: 1: local: -r: bad variable name

-:4:2: error: In dash, 'local' accepts no option. [SC3043]