[perl #131991] AutoReply: [REGEX] Longest Alternation followed by an Alternation fails

[Shy Guy via RT]

This is Rakudo version 2017.07-155-gc229022cb built on MoarVM version
2017.07-378-g5e94da03
implementing Perl 6.c.

Linux Kataomoi 4.13.0-rc6
CPU E3-1230 V2 @ 3.30GHz GenuineIntel GNU/Linux

Also tested on IRC with Moar and Star
This is not specific to right side nested alternations.

*Example 4:*
'succeed'.match(/ [fail || succeed] | suc /).say;
Result:
｢suc｣
Expected:
｢succeed｣