Public bug reported:

From https://gitlab.com/apparmor/apparmor/-/merge_requests/1803:

In AppArmor policy, unix addresses must start with @, and when trying to
use alternations {.,.}, the parser would confuse that with an invalid
variable, rightfully so. The problem is that this was supported in
previous versions of the parser, so in order to not regress behavior, we
are accepting such strings.

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2126450

Title:
  AppArmor Unix socket rules need to be able to support addr=@{a,b}
  variable usage

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