package a::b::c;
use a::b qw[ :all ];
require Exporter;

our @ISA = qw[ Exporter ];
our @EXPORT = @a::b::EXPORT;
our @EXPORT_OK = ( @a::b::EXPORT_OK, 'sensible' );
our %EXPORT_TAGS = %a::b::EXPORT_TAGS;

push @{ $EXPORT_TAGS{ all } }, 'sensible';

sub sensible{ print 'sensible' }

1;