Devel::Cover with Moose?

Paul Johnson paul at
Mon May 23 19:26:42 BST 2011

On Mon, May 23, 2011 at 06:27:22PM +1000, Toby Corkindale wrote:
> Is anyone else using Devel::Cover with Moose, much?
> I seem to get megabytes of warnings displayed even on trivial modules.
> It's trying to create MD5 digests of files containing the materialised
> functions created by __PACKAGE__->meta->make_immutable.
> For example:
> $ cat
> package Foo;
> use Moose;
> __PACKAGE__->meta->make_immutable;
> 1;
> $ perl -MDevel::Cover -e 'use Foo'
> I've filed a bug report, but I don't suppose there's just an easy workaround?

I've read the bug report.  I don't suppose there is, unless you count
piping the output through grep -v "Can't" as an easy workaround.  It's
quite easy, at least.

Is the problem just that there is a lot of noise, or are the results
incorrect in some way too?

The noise I can probably deal with.  The problem is, I suppose, that
Moose is making up filenames and then when Devel::Cover takes it at its
word and goes to look in those files it finds that Moose was actually
telling porky pies, and so it complains about that.

Does Moose consistently format its made up filenames in some way that I
could recognise them?  Is there any useful information in the made up
filenames or should I just ignore them completely?

I realise that this is not the appropriate list for this discussion, but
I'm not on any Moose lists and you didn't ask in perl-qa :-P

Paul Johnson - paul at

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