Test chaining of !before/!after
Test chaining of !before/!after

RT#125575: https://rt.perl.org/Ticket/Display.html?id=125575

Includes fudges for mixed combinations, pending resolution of
R#1304: https://github.com/rakudo/rakudo/issues/1304

dogbert17/roast,dogbert17/roast,perl6/roast