WARNING: unhandled Failure detected in DESTROY. No such symbol '<class 'numpy.int64'>'

[librasteve]

The Problem

I am developing raku::Dan::Pandas on ubuntu and getting an unwanted WARNING apparently from the GC

This is a block to getting that module working (I'm about 80% done after 4 months effort) - and also impacts the active promotion of raku::Dan since Python compatibility is an important aspect for interworking with Python workflows and providing a fully featured raku alternative.

Please help!
~p6steve

Expected Behavior

/raku-Dan-Pandas/bin/synopsis-dan-pandas.raku runs without error

Please note that the module is being build "in context" with deps such as Inline::Python on the jupyter scipy-notebook image via Dockerfile.

Yes, <class 'numpy.int64'> is a Python symbol. I am happy to take any fix over to a PR for Inline::Python if you can tell me what to do.

I have found some prior art on this issue:

Actual Behavior

WARNING: unhandled Failure detected in DESTROY. If you meant to ignore it, you can mark it as handled by calling .Bool, .so, .not, or .defined methods. The Failure was:
No such symbol '<class 'numpy.int64'>'
in block at /home/jovyan/raku-Dan-Pandas/bin/../lib/Dan/Pandas.rakumod (Dan::Pandas) line 587
in block at /home/jovyan/raku-Dan-Pandas/bin/../lib/Dan/Pandas.rakumod (Dan::Pandas) line 585
in block at /home/jovyan/raku-Dan-Pandas/bin/../lib/Dan/Pandas.rakumod (Dan::Pandas) line 582
in method TWEAK at /home/jovyan/raku-Dan-Pandas/bin/../lib/Dan/Pandas.rakumod (Dan::Pandas) line 568
in method new at /home/jovyan/raku-Dan-Pandas/bin/../lib/Dan/Pandas.rakumod (Dan::Pandas) line 426
in block at ./synopsis-dan-pandas.raku line 140

Steps to Reproduce

git clone https://github.com/p6steve/raku-Dan-Pandas.git@GC-issue [note this branch made to freeze at this bug state]
docker build -it p6steve/raku-dan:pandas-2022.02-arm64 [1]
docker run -it p6steve/raku-dan:pandas-2022.02-arm64
./raku-Dan-Pandas/bin/synopsis-dan-pandas.raku

It happens on every run on my setup. Commenting out the line below stops it.
145 E => Categorical.new(),

[1] adjust to amd64 by changing Dockerfile first line to FROM --platform=linux/amd64 jupyter/scipy-notebook]

Environment

• Operating system: ubuntu
• Compiler version (perl6 -v or raku -v):
  Welcome to Rakudo™ v2022.02.
  Implementing the Raku® Programming Language v6.d.
  Built on MoarVM version 2022.02.

[grondilu]

I also get a similar annoying warning in one of my projects.

WARNING: unhandled Failure detected in DESTROY. If you meant to ignore it, you can mark it as handled by calling .Bool, .so, .not, or .defined methods. The Failure was:

The indicated failure is consistent with a method call, but I have no idea why that method would be called upon destruction of the object. Also, this method call is inside a try block so I really don't get why the compiler would complain about an unhandled failure.

I can't reliably reproduce it, nor can I figure out a way to golf it. Sorry, I know this is not helpful, I'm just bumping this issue.

$ raku -v
Welcome to Rakudo™ v2022.03-175-g9a860ca85.
Implementing the Raku® Programming Language v6.d.
Built on MoarVM version 2022.03-15-g43e1b00a6.

PS. ok I tried to write a toy example of code reproducing the warning: https://gist.github.com/grondilu/39bcb969f7aaca7c38ae2533a1289049

It does not show every time, but about once at of ten.