Error reproduced! :-)
Here's a one line patch for Moo::Role that fixes your issue. I'll report it to the Moo bug tracker when I've figured out why this patch makes any difference to anything!
# Replace this sub...
sub apply_roles_to_package {
my ($me, $to, @roles) = @_;
$me->_inhale_if_moose($_) for @roles;
$me->SUPER::apply_roles_to_package($to, @roles);
}
# With this instead...
sub apply_roles_to_package {
my ($me, $to, @roles) = @_;
for my $r (@roles) { $me->_inhale_if_moose($r) };
$me->SUPER::apply_roles_to_package($to, @roles);
}
Update: OK, it happens because something inadvertently causes the global $_ to become undefined.
Update 2: Bug report submitted.
Update 3: patched on git.
Update 4 (about a week later): Moo 1.000006 released.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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