[Bug 221130] libxo anchor roles don't work as documented

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221130

            Bug ID: 221130
           Summary: libxo anchor roles don't work as documented
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markj at FreeBSD.org

I'm trying to use libxo anchor roles in a piece of code, but they're not
working as described in xo_format(5):

     To give a width directly, encode it as the content of the anchor tag:

               xo_emit("({[:10}{:min/%d}/{:max/%d}{]:})\n", min, max);

     To pass a width as an argument, use "%d" as the format, which must appear
     after the "/".  Note that only "%d" is supported for widths.  Using any
     other value could ruin your day.

               xo_emit("({[:/%d}{:min/%d}/{:max/%d}{]:})\n", width, min, max);

However, an attempt to follow this example leads to the width being printed:

$ xo "{[:/%d}{:address/%p}{]:}\n" 18 0xdeadbeef
0x12
$ xo "{[:18}{:address/%p}{]:}\n" 0xdeadbeef
        0xdeadbeef

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