[perl #122882] [BUG] Symmetric set difference (^) doesn't right-associate or chain in Rakudo

[Carl Mäsak via RT]

<lizmat> $ 6 'say <a network> (^) <b network> (^) <a network>'
<lizmat> set(b)
<lizmat> #122882 can be marked as TEST NEEDED :-)

Marked as testneeded.