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Can't do 'handles' on a type in Rakudo #2319

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p6rt opened this issue Jan 1, 2011 · 3 comments
Open

Can't do 'handles' on a type in Rakudo #2319

p6rt opened this issue Jan 1, 2011 · 3 comments
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@p6rt
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@p6rt p6rt commented Jan 1, 2011

Migrated from rt.perl.org#81548 (status was 'open')

Searchable as RT81548$

@p6rt
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@p6rt p6rt commented Jan 1, 2011

From @masak

<masak> rakudo​: class A { has @​.b handles Array }; my $a = A.new; say
$a.b.perl; $a.push(1, 2, 3); say $a.b.perl
<p6eval> rakudo b570a2​: OUTPUT«[]␤Method 'push' not found for invocant
of class 'A'␤ in main program body at line 22​:/tmp/KrHSBT37lh␤»
<masak> aww.
* masak submits rakudobug
<masak> would have been really cool if that worked...
<moritz_> what's the bug?
<masak> S12​:1366​: "If you say C<has $.fur is rw handles Groomable;>
then you get only those methods available via the C<Groomable> role or
class."
<moritz_> ah.
<masak> by extension, I expected to get the methods available via Array.

@p6rt
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@p6rt p6rt commented Jan 5, 2011

From @moritz

FWIW 'has $!a handles TypeObject' is now implemented, and works fine for
roles.

It doesn't work for classes, because they have a .new method. So the
standard .new is overridden, trying to call the .new on an attribute,
but since there's no instance yet, the access to the attribute fails.

That's a conceptual problem and needs a spec resolution.

One possible approach would be to only install methods not yet present
in $?CLASS or its superclassess.... any better ideas?

Moritz

@p6rt
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@p6rt p6rt commented Jan 5, 2011

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

@p6rt p6rt added the NYI label Jan 5, 2020
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