Last message still reproducible (2017.11,HEAD(e5b660e))
On 2015-09-05 03:44:49, elizabeth wrote:
> One would expect an error message such as:
>
> $ 6 'role R[$a,$b] {}; class C does R[1] {}'
> ===SORRY!===
> No appropriate parametric role variant available for ‘R'
>
> but even that message is rather LTA, as it doesn’t mention which
> parameters were tried and which candidates are available.
>
>
>
> Liz
> ====================
> > On 05 Sep 2015, at 12:38, dakkar (via RT) <perl6-bugs-
> > follo...@perl.org> wrote:
> >
> > # New Ticket Created by dakkar
> > # Please include the string: [perl #125996]
> > # in the subject line of all future correspondence about this issue.
> > # <URL: https://rt.perl.org/Ticket/Display.html?id=125996 >
> >
> >
> > This code::
> >
> > role R[$a,$b] {}
> > role R2[$x] does R[1] {}
> > class C does R2[1] {}
> >
> > C.new;
> >
> > Produces the error message::
> >
> > ===SORRY!===
> > Cannot find method 'collisions'
> >
> > The error happens in ``RoleToClassApplier::apply``: something goes
> > wrong with the nested role specialisation, and the compiler tries to
> > apply a ``NQPMu``.
> >
> > --
> > Dakkar - <Mobilis in mobile>
> > GPG public key fingerprint = A071 E618 DD2C 5901 9574
> > 6FE2 40EA 9883 7519 3F88
> > key id = 0x75193F88
> >
> > Giving up on assembly language was the apple in our Garden of Eden:
> > Languages whose use squanders machine cycles are sinful. The LISP
> > machine now permits LISP programmers to abandon bra and fig-leaf.
> > -- Epigrams in Programming, ACM SIGPLAN Sept. 1982
