[Bug 247931] sed "y" command bracket balancing check

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247931

            Bug ID: 247931
           Summary: sed "y" command bracket balancing check
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: lhoursquentin at gmail.com

When using the "y" command, it seems like square bracket balancing is required.
Square brackets should instead be treated like any other character in the "y"
cmd context, as they are already at the time of doing the actual character
replacement:

sh$ echo | sed 'y/[/x/'
sed: 1: "y/[/x/": unbalanced brackets ([])
sh$ echo | sed 'y/[]/xy/'
sed: 1: "y/[]/xy/": unbalanced brackets ([])
sh$ echo | sed 'y/[a]/xyz/'

sh$ echo '][a' | sed 'y/[a]/xyz/'
zxy

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