package alias;
use strict;

BEGIN {
    use base qw(Exporter);
    @alias::EXPORT = qw(make_alias);
}

sub make_alias {
    tie $_[0], __PACKAGE__, \$_[1];
}

sub TIESCALAR {
    my($class, $target_ref) = @_;
    bless $target_ref, $class;
}

sub STORE {
    my $self = shift;
    $$self = shift;
}

sub FETCH {
    my $self = shift;
    $$self;
}

1;

##</code><code>##

use alias;

my $self = { x => 1 };
make_alias my $x, $self->{x};

$x = 100;
print $self->{x}; # 100