From @masak

<masak> r​: https://gist.github.com/masak/5124688
<p6eval> rakudo 5a6b52​: OUTPUT«set(abcd, bacd, acbd, abdc, badc, adbc,
dabc, adcb, dacb, acdb, cadb, cdab, cabd, cbad, bcad, cbda, bcda,
cdba, dcba, dbca, dcab, bdca, dbac, bdac)␤»
<masak> \o/
<TimToady> masak​: $set = $set (|) $d; <-- why not (|)= ?
<masak> TimToady​: didn'a work :(
<masak> r​: my $s = set; $s (|)= 5
<p6eval> rakudo 5a6b52​: OUTPUT«===SORRY!===␤Two terms in a row␤at
/tmp/VbH2WyDu5i​:1␤------> my $s = set; $s ⏏(|)= 5␤ [...]
* masak submits rakudobug
<TimToady> masak​: you should get masak to file a...
<masak> TimToady​: this time, I was faster than that guy! :P

From @FROGGS

FROGGS m​: my $s = set; $s (|)= 5; say $s
camelia rakudo-moar bbdcfd​: OUTPUT«set(5)␤»

Test​: Raku/roast@2e900e5d4b

@FROGGS - Status changed from 'new' to 'resolved'