Possible PadWalker missing dependency

[tobyink]

Migrated from rt.cpan.org #133926 (status was 'open')

Requestors:

• [email protected]

From [email protected] on 2020-12-20 21:14:43
:

Hi,

Reporting a possible missing dependency: PadWalker.

While testing my Art::World module (largely based on Zydeco) in CPANTesters or
on Gitlab-CI, I experiment a missing PadWalker dependency message and a fail of
all tests.

https://gitlab.com/smonff/art-world/-/jobs/923576336

Can't say if it is coming from Zydeco or from an upper level, but the main
information I have is:

Error: Can't locate PadWalker.pm in @inc (you may need to install the

PadWalker module) (@inc contains: /builds/smonff/art-world/lib
/builds/smonff/art-world/local/lib/perl5/5.32.0/x86_64-linux-gnu etc.) at
/builds/smonff/art-world/local/lib/perl5/Zydeco.pm line 847.

This precise 847 line in Zydeco.pm is "requiring" PadWalker, so I guess it is a
start...

If I had PadWalker to the dependencies of my project, everything is fine. Looks
like it has been removed from someone else's dependencies, maybe? Or, I started
to use some features of Zydeco requiring the use of PadWalker, but my
understanding of Zydeco's internal code is a bit limited to go further about
this.

Thanks and happy Christmas!

[tobyink]

From [email protected] on 2020-12-26 23:28:28
:

It's caused by using:

Num $gain = $self->config->{ FAME }->{ DEFAULT_BUMP }

In one of your signatures. Zydeco needs to do some pretty nasty stuff to figure out what $self is because at the time defaults are evaluated, $self isn't in scope.

I really need to find a better solution for this.

[tobyink]

From [email protected] on 2021-01-08 16:29:28
:

It's caused by using:

Num $gain = $self->config->{ FAME }->{ DEFAULT_BUMP }

In one of your signatures. Zydeco needs to do some pretty nasty stuff
to figure out what $self is because at the time defaults are
evaluated, $self isn't in scope.

I really need to find a better solution for this.

Is it "normal" that adding PadWalker as a dependency "solve" the problem?

I tried to take advantage of the implicit declaration of $self that seemed to
be an acceptable possibility from what I understood. It looks quite surprising
that it can be this way, but why not? Even if some error messages are a bit
difficult to target, Zydeco is still fun to use.

For some issues I encountered, including this one, I just required the use of a
Perl > 5.24.0. Seems like quite rude, but I don't think this experiment I do
will be reused by many people ^^.

[tobyink]

From [email protected] on 2021-01-09 21:37:53
:

Yeah, Zydeco should probably have a dependency on PadWalker for this, but even better would be to fix things so Zydeco doesn't need to use PadWalker for it.