negation of SC2252, [ "$1" = foo ] && [ "$1" = bar ], is not detected

[e-kwsm]

For bugs

• Rule Id (if any, e.g. SC1000): SC2252?
• 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/sh
# ! { [ "$1" != foo ] || [ "$1" != bar ]; }  # SC2252 is issued
if [ "$1" = foo ] && [ "$1" = bar ]
then
  echo "$1 is foo or bar"
fi

Here's what shellcheck currently says:

Nothing.

Here's what I wanted or expected to see:

Line 3:
if [ "$1" = foo ] && [ "$1" = bar ]
                  ^-- SC2252 (warning): You probably wanted || here, otherwise it's always false.