Null PMC access when calling *any* method on a multi sub in Rakudo

[p6rt]

Migrated from rt.perl.org#63568 (status was 'resolved')

Searchable as RT63568$

[p6rt]

From @masak

<szabgab> oh and is arity defined on multi subs ?
<szabgab> rakudo​: sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«1␤»
<szabgab> rakudo​: multi sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«Null PMC access in find_method()␤ [...]
* masak submits rakudobug
<masak> szabgab++

[p6rt]

From @masak

Also .signature on multis​:

<szabgab> rakudo​: sub f($z) {}; &f.signature.perl.say
<p6eval> rakudo af4b73​: OUTPUT«​:(Any $z)␤»
<szabgab> rakudo​: multi sub f($z) {}; &f.signature.perl.say
<p6eval> rakudo af4b73​: OUTPUT«Null PMC access in find_method() [...]

[p6rt]

From [Unknown Contact. See original ticket]

Also .signature on multis​:

<szabgab> rakudo​: sub f($z) {}; &f.signature.perl.say
<p6eval> rakudo af4b73​: OUTPUT«​:(Any $z)␤»
<szabgab> rakudo​: multi sub f($z) {}; &f.signature.perl.say
<p6eval> rakudo af4b73​: OUTPUT«Null PMC access in find_method() [...]

[p6rt]

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

[p6rt]

From @moritz

On Sun Mar 01 02​:44​:17 2009, masak wrote​:

<szabgab> oh and is arity defined on multi subs ?
<szabgab> rakudo​: sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«1␤»
<szabgab> rakudo​: multi sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«Null PMC access in find_method()␤ [...]
* masak submits rakudobug
<masak> szabgab++

Actually calling *any* method on &f gives the Null PMC access, if f() is
a multi​:

./perl6 -e 'multi f { ... }; say &f.WHAT'
Null PMC access in find_method()

Cheers,
Moritz

[p6rt]

From @jnthn

On Tue Mar 10 13​:45​:27 2009, moritz wrote​:

On Sun Mar 01 02​:44​:17 2009, masak wrote​:

<szabgab> oh and is arity defined on multi subs ?
<szabgab> rakudo​: sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«1␤»
<szabgab> rakudo​: multi sub f($z) {}; &f.arity.say
<p6eval> rakudo af4b73​: OUTPUT«Null PMC access in find_method()␤ [...]
* masak submits rakudobug
<masak> szabgab++

Actually calling *any* method on &f gives the Null PMC access, if f() is
a multi​:

./perl6 -e 'multi f { ... }; say &f.WHAT'
Null PMC access in find_method()

Fixed this somewhat. Notes​:

* .WHAT now reports Multi and this is spectest'd.
* .candidates can be called to get the set of candidates. You can then
use .signature and .arity on those (.candidates is not quite spec yet,
but probably fine and reasonable to go in to the spec - someone has
agreed to do that in the next day or so)
* .signature and .arity for now are not defined on Multi - it's not
spec'd and I'm not so sure exactly what it'd do, though an any junction
seems easiest. But maybe better to make people write
any(&foo.candidates).signature to get that (this produces an any
junction of signatures).

See 76b2652.

Thanks,

Jonathan

[p6rt]

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