From @masak

<masak> rakudo​: say 0 ~~ 0 ~~ 0
<p6eval> rakudo cae7f9​: OUTPUT«Bool​::False␤»
* masak submits rakudobug
<masak> just saw that ~~ is "chaining infix" :)
<masak> that surprises me. but hey, it's spec. :P
<moritz_> wtf?
<masak> I have *no* idea whatsoever how I would use the chainedness of ~~
<masak> of course, if ~~ is chaining, it can chain with *other*
operators. and that might be useful.
<masak> rakudo​: say "foo" ~~ "foo" ge "bar"
<p6eval> rakudo cae7f9​: OUTPUT«Bool​::False␤»
<masak> both of these evaluations should be "Bool​::True" according to the spec.

From @ShimmerFairy

The presented examples have been added to S03-operators/relational.t

From what I've looked at, this seems to be caused by ~~ being specially handled in rakudo; see #​125745 for another bug possibly caused by this.

The RT System itself - Status changed from 'new' to 'open'

From @TimToady

~~ is now chaining where it can be; it obviously makes little sense to chain something on both sides that is not a normal data value. So if you include a regex or a closure, it must be the final test. Also, in order
to get $a ~~ $b ~~ $c to work, we cannot topicalize $b.

Fix in f457007181bb6e2dcb6aefe857f36d648ae38401

Tests in cf080c9f958bc3153dde217b107c65ddb617afe6

@TimToady - Status changed from 'open' to 'resolved'