From @masak

<gfldex> r​: https://gist.github.com/2518066
<p6eval> rakudo a25e7d​: OUTPUT«Null PMC access in find_method('slots') [...]
<jnthn> Eek. That looks bad.
<moritz> @​.slots.push([$sender, $rcpt, $method]);
<moritz> that shouldn't ever work
<moritz> because @​!slots is typed to contain Method objects
<moritz> and you try to push an array on it
<jnthn> Wow, yes.
<moritz> r​: class A { has Method @​.slots; }; A.new.slots.push​: [1, 2, 3]
<p6eval> rakudo a25e7d​: ( no output )
<moritz> masak​: wanna submit?
* masak submits rakudobug
<gfldex> changed Method @​.slots to just @​.slots, still Null PMC
<masak> gfldex​: right, that's not the cause of the Null PMC access. we
know this.
<masak> ;)
<masak> just finding different, easier errors on the way.

From @coke

Adding contents of gist as an attachment on the ticket.
--
Will "Coke" Coleda

From @coke

112660.p6

@coke - Status changed from 'new' to 'open'

From @diakopter

On Sat Apr 28 04​:28​:00 2012, masak wrote​:

<gfldex> r​: https://gist.github.com/2518066
<p6eval> rakudo a25e7d​: OUTPUT�Null PMC access in
find_method('slots') [...]
<jnthn> Eek. That looks bad.
<moritz> @​.slots.push([$sender, $rcpt, $method]);
<moritz> that shouldn't ever work
<moritz> because @​!slots is typed to contain Method objects
<moritz> and you try to push an array on it
<jnthn> Wow, yes.
<moritz> r​: class A { has Method @​.slots; }; A.new.slots.push​: [1, 2,
3]
<p6eval> rakudo a25e7d​: ( no output )
<moritz> masak​: wanna submit?
* masak submits rakudobug
<gfldex> changed Method @​.slots to just @​.slots, still Null PMC
<masak> gfldex​: right, that's not the cause of the Null PMC access. we
know this.
<masak> ;)
<masak> just finding different, easier errors on the way.

doesn't NPA anymore, but has this error​:

19​:37 <diakopter> r​: https://gist.github.com/2831711
19​:37 <p6eval> rakudo 024843​: OUTPUT«Button()App()Method()␤Too many
positional parameters
  passed; got 2 but expected 1␤ in method exit at
/tmp/dm3wfSpvKW​:39␤ in sub
  handle_call at /tmp/dm3wfSpvKW​:23␤ in any enter at
  src/gen/Metamodel.pm​:2697␤ in method postcircumfix​:<(
)> at
  src/gen/CORE.setting​:1…

From @usev6

AFAIU this ticket is about the type of @​.slots not being respected. This seems to be fixed now​:

$ perl6 -e 'class A { has Method @​.slots; }; A.new.slots.push​: [1, 2, 3]'
Type check failed in assignment to '@​!slots'; expected 'Method' but got 'Array'
  in block <unit> at -e​:1

I added a test to S32-array/push.t with commit Raku/roast@d466fc79bb.

I'm closing this ticket as 'resolved'.

@usev6 - Status changed from 'open' to 'resolved'