On Thu Aug 27 03:06:07 2015, coke wrote:
> On Sat Mar 28 16:15:48 2015, esteiner wrote:
> > According to its definition, squish should always return at least the
> > first list element in the result list, no matter what &with returns.
> >
> > Currently it can happen that squish returns an empty list if &with
> > returns true on the first comparison:
> >
> > This is perl6 version 2015.03 built on MoarVM version 2015.03
> >
> >
> > > <a a>.squish(:with(-> $a, $b {1})).perl.say
> > ().list
> >
> > This works with unique:
> >
> > > <a a>.unique(:with(-> $a, $b {1})).perl.say
> > ("a",).list
>
> I don't see this in the synopses, but only in the test file, and it
> looks like the tests were originally added after this ticket was
> opened. Can we get a ruling as to whether this is required? (Or a
> pointer to something in the Syn?)
I think the relevant sentence from S32/Containers.html is
"Returns a list of values from the invocant/argument list
where runs of more than one value are replaced with only
the first instance."
AFAIU .squish is not meant to wipe out all values -- regardless of the
comparison function provided via :with. The bug report looks valid to me.
For the records: :with was added to the design docs with commit ec1b7c619d
(which has a link to the IRC logs) and was removed less than 24 hours later
(c313c2918e). It was implemented for Rakudo with commit 8d851b7831.
