Missing serialize REPR function for REPR SCRef | When using a class using a trait that modify metamodel #5254

p6rt · 2016-04-22T14:43:52Z

Migrated from rt.perl.org#127959 (status was 'resolved')

Searchable as RT127959$

p6rt · 2016-04-22T14:43:52Z

From pierre.vigier@gmail.com

Hi

Basically, i have a trait that add a method to a class if applied to an attribute
it's working well
however, if i try to 'use' a class that uses that trait, i have a strange error:
Missing serialize REPR function for REPR SCRef

To show case the issue, here is a dummy module, that export a trait "mytrait".
That trait if applied to any attribute of a class, will add a new method nn to the class that returns 'nn'.
(the original module is AttrX::Lazy, just wanted to trimdown the code base)

file mytraitmodule.pm6 contains that trait

you can see that tiny trait in action with the following:

PERL6LIB=$PWD perl6 -e 'use mytraitmodule; class Foo { has $!att is mytrait; }; say Foo.new().nn()' [22:18:23]
nn

The trait is working fine.

Now, if i create a class in a separate file, that does the same thing, and load the class, for the class see file myclass.pm6
and i just try to use that new class, with a simple code like:

PERL6LIB=$PWD perl6 -e 'use myclass;' [22:18:12]
===SORRY!===
Missing serialize REPR function for REPR SCRef

You see the issue, really strange, the trait is working by itself, but it's impossible to load a class that uses that trait

RabidGravy on IRC told me to add a no precompilation statement on top of the file having the role to temporary solve the issue, and i can confirm it is working.

Content of the files:
myclass.pm6:

unit class myclass;
use mytraitmodule;

has $!bar is mytrait;

mytraitmodule.pm6:

unit module mytraitmodule;
my role rrHOW {
method compose(Mu \type) {
type.^add_method('nn', method (Mu:D:) { return 'nn' ; } );
callsame;
}
}

multi trait_mod:<is>(Attribute:D $attr, :$mytrait! ) is export {
$attr.package.HOW does rrHOW;
}

Pierre

p6rt · 2016-04-26T13:20:45Z

From @LLFourn

This is yet another compile time closure serialisation bug. I made a list
of all of them I could find:

and added this one to the list :)

On Sun, Apr 24, 2016 at 5:02 AM Pierre VIGIER <perl6-bugs-followup@perl.org>
wrote:

# New Ticket Created by Pierre VIGIER
# Please include the string: [perl #127959]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127959 >

Hi

Basically, i have a trait that add a method to a class if applied to an
attribute
it's working well
however, if i try to 'use' a class that uses that trait, i have a strange
error:
Missing serialize REPR function for REPR SCRef

To show case the issue, here is a dummy module, that export a trait
"mytrait".
That trait if applied to any attribute of a class, will add a new method
nn to the class that returns 'nn'.
(the original module is AttrX::Lazy, just wanted to trimdown the code base)

file mytraitmodule.pm6 contains that trait

you can see that tiny trait in action with the following:

PERL6LIB=$PWD perl6 -e 'use mytraitmodule; class Foo { has $!att is
mytrait; }; say Foo.new().nn()' [22:18:23]
nn

The trait is working fine.

Now, if i create a class in a separate file, that does the same thing, and
load the class, for the class see file myclass.pm6
and i just try to use that new class, with a simple code like:

PERL6LIB=$PWD perl6 -e 'use myclass;'
[22:18:12]
===SORRY!===
Missing serialize REPR function for REPR SCRef

You see the issue, really strange, the trait is working by itself, but
it's impossible to load a class that uses that trait

RabidGravy on IRC told me to add a no precompilation statement on top of
the file having the role to temporary solve the issue, and i can confirm it
is working.

Content of the files:
myclass.pm6:
--------------------
unit class myclass;
use mytraitmodule;

has $!bar is mytrait;
--------------------

mytraitmodule.pm6:
--------------------
unit module mytraitmodule;
my role rrHOW {
method compose(Mu \type) {
type.^add_method('nn', method (Mu:D:) { return 'nn' ; } );
callsame;
}
}

multi trait_mod:<is>(Attribute:D $attr, :$mytrait! ) is export {
$attr.package.HOW does rrHOW;
}
--------------------

Pierre

p6rt · 2016-04-26T13:20:46Z

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

p6rt · 2017-04-28T04:13:34Z

From pierre.vigier@gmail.com

I'm not sure when it got fixed, but the same code now is working without any issues, should we close the ticket?

On Tue, 26 Apr 2016 06:20:45 -0700, lloyd.fourn@gmail.com wrote:

This is yet another compile time closure serialisation bug. I made a
list
of all of them I could find:

https://rt.perl.org/Public/Bug/Display.html?id=125634
<https://rt.perl.org/Public/Bug/Display.html?id=126818>
https://rt.perl.org/Public/Bug/Display.html?id=126818
https://rt.perl.org/Public/Bug/Display.html?id=127034
https://rt.perl.org/Public/Bug/Display.html?id=127112
<https://rt.perl.org/Public/Bug/Display.html?id=127858>
https://rt.perl.org/Public/Bug/Display.html?id=127858
<https://rt.perl.org/Public/Bug/Display.html?id=127860>
https://rt.perl.org/Public/Bug/Display.html?id=127860
https://rt.perl.org/Public/Bug/Display.html?id=127959

and added this one to the list :)

On Sun, Apr 24, 2016 at 5:02 AM Pierre VIGIER <perl6-bugs-
followup@perl.org>
wrote:

# New Ticket Created by Pierre VIGIER
# Please include the string: [perl #127959]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=127959 >

Hi

Basically, i have a trait that add a method to a class if applied to
an
attribute
it's working well
however, if i try to 'use' a class that uses that trait, i have a
strange
error:
Missing serialize REPR function for REPR SCRef

To show case the issue, here is a dummy module, that export a trait
"mytrait".
That trait if applied to any attribute of a class, will add a new
method
nn to the class that returns 'nn'.
(the original module is AttrX::Lazy, just wanted to trimdown the code
base)

file mytraitmodule.pm6 contains that trait

you can see that tiny trait in action with the following:

PERL6LIB=$PWD perl6 -e 'use mytraitmodule; class Foo { has $!att is
mytrait; }; say Foo.new().nn()' [22:18:23]
nn

The trait is working fine.

Now, if i create a class in a separate file, that does the same
thing, and
load the class, for the class see file myclass.pm6
and i just try to use that new class, with a simple code like:

PERL6LIB=$PWD perl6 -e 'use myclass;'
[22:18:12]
===SORRY!===
Missing serialize REPR function for REPR SCRef

You see the issue, really strange, the trait is working by itself,
but
it's impossible to load a class that uses that trait

RabidGravy on IRC told me to add a no precompilation statement on top
of
the file having the role to temporary solve the issue, and i can
confirm it
is working.

Content of the files:
myclass.pm6:
--------------------
unit class myclass;
use mytraitmodule;

has $!bar is mytrait;
--------------------

mytraitmodule.pm6:
--------------------
unit module mytraitmodule;
my role rrHOW {
method compose(Mu \type) {
type.^add_method('nn', method (Mu:D:) { return 'nn' ; } );
callsame;
}
}

multi trait_mod:<is>(Attribute:D $attr, :$mytrait! ) is export {
$attr.package.HOW does rrHOW;
}
--------------------

Pierre

p6rt · 2017-04-29T02:08:54Z

From @zoffixznet

On Thu, 27 Apr 2017 21:13:34 -0700, pierre.vigier@gmail.com wrote:

I'm not sure when it got fixed, but the same code now is working
without any issues, should we close the ticket?

Marking this as Tests needed

p6rt · 2018-02-02T19:34:58Z

From @zoffixznet

Tests: Raku/roast@72f2c3984c

p6rt · 2018-02-02T19:34:58Z

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

p6rt closed this as completed Feb 2, 2018

p6rt added Bug testneeded labels Jan 5, 2020

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Missing serialize REPR function for REPR SCRef | When using a class using a trait that modify metamodel #5254

Missing serialize REPR function for REPR SCRef | When using a class using a trait that modify metamodel #5254

p6rt commented Apr 22, 2016

p6rt commented Apr 22, 2016

p6rt commented Apr 26, 2016

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p6rt commented Feb 2, 2018

Missing serialize REPR function for REPR SCRef | When using a class using a trait that modify metamodel #5254

Missing serialize REPR function for REPR SCRef | When using a class using a trait that modify metamodel #5254

Comments

p6rt commented Apr 22, 2016

p6rt commented Apr 22, 2016

From pierre.vigier@gmail.com

p6rt commented Apr 26, 2016

From @LLFourn

p6rt commented Apr 26, 2016

p6rt commented Apr 28, 2017

From pierre.vigier@gmail.com

p6rt commented Apr 29, 2017

From @zoffixznet

p6rt commented Feb 2, 2018

From @zoffixznet

p6rt commented Feb 2, 2018