package Foo; 
use strict; 
use warnings; 
our $VERSION = 1.23; 
1;

##</code><code>##

$ perl5.10.0 -e 'use Foo 0.001001'

$ perl5.8.9 -e 'use Foo 0.001001'
Foo version 0.001001 required--this is only version 0.001001 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.8.9 -Mversion -e 'use Foo 0.001001'

##</code><code>##

$ perl5.10.0 -e 'use Foo v0.1_1'
Foo version v0.1_1 required--this is only version v0.0_1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.8.0 -e 'use Foo v0.1_1'
Foo version v0.1.1 required--this is only version v0.0.1  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.6.2 -e 'use Foo v0.1_1'
Foo version 0.011 required--this is only version 0  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

##</code><code>##

$ perl5.10.0 -e 'use Foo 0.000001'
Foo version 0.000001 required--this is only version v0.0_1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.10.0 -e 'use Foo v0.0_1'

$ perl5.8.9 -e 'use Foo v0.0_1'

$ perl5.8.0 -e 'use Foo v0.0_1'
Foo version v0.0.1 required--this is only version v0.0_1  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.6.2 -e 'use Foo v0.0_1'
Foo version 0.001 required--this is only version v0.0_1  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

##</code><code>##

$ perl5.10.0 -e 'use Foo v0.1.1'

$ perl5.8.9 -e 'use Foo v0.1.1'

$ perl5.10.0 -e 'use Foo v0.2.1'
Foo version v0.2.1 required--this is only version v0.1.1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.8.9 -e 'use Foo v0.2.1'
Foo version 0.002001 required--this is only version 0.001001 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.