Shellcheck useless-suppression à la pylint

[LLyaudet]

For new checks and feature suggestions

• https://www.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 a potential problem:

#!/bin/bash

# shellcheck disable=SC1000
a="WAT"

echo "${a}"

Here's what shellcheck currently says:

No warning at all.

Here's what I wanted to see:

A warning for SC9999, useless-suppression like in pylint:

Warning SC9999:  useless-suppression
The suppression for SC1000 at line 3 is useless:
# shellcheck disable=SC1000
No violation of SC1000 is reported if you remove it.