Using a reference:

$ perl -MData::Dumper -e'
   sub Foo::Bar::baz {}
   print(Dumper(\%Foo::Bar::))
'
$VAR1 = {
          'baz' => *Foo::Bar::baz
        };
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Using a symbolic reference:

$ perl -MData::Dumper -e'
   sub Foo::Bar::baz {}
   print(Dumper(\%{"Foo::Bar::"}));
'
$VAR1 = {
          'baz' => *Foo::Bar::baz
        };
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Neither hardcoded nor a symbolic reference:

$ perl -MData::Dumper -e'
   sub Foo::Bar::baz {}
   print(Dumper(\%{ $::{"Foo::"}{"Bar::"} }));
'
$VAR1 = {
          'baz' => *Foo::Bar::baz
        };
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So, you can do

no strict 'refs'; \%{ $package . '::' };
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or you can do

my $r = \%::; $r = $r->{$_ . '::'} for split /::/, $package; \%$r
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