From @MARTIMM

Hi,

According to the documentation one should use the following to trap a
failure when loading a module fails using require;

try require :​:('Foo');
note :​:('Foo').Str if :​:('Foo') ~~ Failure;

The problem with this is that it isn't visible what is going wrong.
Using plain

require :​:('Foo');

an exception is thrown with a proper error and stack dump. However when
there are no errors in the module, there are other exceptions thrown
with messages like

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 'Foo'
  in block at ... (...) line ...
...

This seems to me a bug. The only way to handle this properly is the
following

try {
  require :​:('Foo');

  ...

  CATCH {
  .note;
  }
}

Perl6 version​: 2018.01-195-g5ae1ca51f built on MoarVM version
2018.01-89-ga01cdb449 implementing Perl 6.c.

Regards,
Marcel

From @AlexDaniel

Pretty sure this is a dup of rakudo/rakudo#1515 , you can follow the progress on the issue there. Let us know if your problem is actually different.

Closing

On 2018-02-25 11​:11​:55, mt1957@​gmail.com wrote​:

Hi,

According to the documentation one should use the following to trap a
failure when loading a module fails using require;

try require :​:('Foo');
note :​:('Foo').Str if :​:('Foo') ~~ Failure;

The problem with this is that it isn't visible what is going wrong.
Using plain

require :​:('Foo');

an exception is thrown with a proper error and stack dump. However
when
there are no errors in the module, there are other exceptions thrown
with messages like

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 'Foo'
in block at ... (...) line ...
...

This seems to me a bug. The only way to handle this properly is the
following

try {
require :​:('Foo');

...

CATCH {
.note;
}
}

Perl6 version​: 2018.01-195-g5ae1ca51f built on MoarVM version
2018.01-89-ga01cdb449 implementing Perl 6.c.

Regards,
Marcel

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

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