The author's response (i tried it and it works, with sub IMPORT) :
This is not a bug in the module.
The problem is that you specified:
sub subr :Export(:DEFAULT) { return "subr() was called\n"; }
:DEFAULT exports are only exported when the module is use'd with no arguments at all.
But then you call:
use Mod3 'argument';
with an argument, so the :DEFAULT exports don't happen.
You could fix this by specifying:
sub subr :Export(:MANDATORY) { return "subr() was called\n"; }
(assuming you always want subr() exported).
If not, then you need to specifically request subr(), like this:
use Mod3 '&subr', 'argument';
or request all the defaults, like this:
use Mod3 ':DEFAULT', 'argument';
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