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use vars '$have_Storable';
$have_Storable = do {
    eval {
...

# ...
# code predicated on the setting of $have_Storable

{
    local $Regexp::Assemble::have_Storable = 0;
...
    my $clone = $orig->clone;
    is_deeply( $orig, $clone, 'clone path' );
}