It’s not Moose, it’s specifically Catalyst’s handling of the information. Probably your Catalyst code is either wonky or relies on the presence of the base packages to already be loaded in such a way that sub packages will fail because they are missing dependent information. Compare these two–

perl -c -e 'sub taco :Chained("/") :PathPart("foo") : CaptureArgs(0) {
+}'
Invalid CODE attributes: Chained("/") : PathPart("foo") : CaptureArgs(
+0) at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
[download]

perl -c -e 'use parent "Catalyst::Controller"; sub taco :Chained("/") 
+:PathPart("foo") : CaptureArgs(0) {}'
-e syntax OK
[download]

Side-note about the -c flag. It’s not just a syntax check, it has to compile code and that means running some of it and there is no way to know what that might include without stepping through it. For example–

# emacs/vi UseMe.pm
package UseMe;
print STDERR "rm -rf /";

perl -c UseMe.pm 
UseMe.pm syntax OK

perl -c -e 'use UseMe'
rm -rf /-e syntax OK
[download]

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