if (COND1) {
    my $var = ...
    } if (COND2) {
    # $var OUT-OF-SCOPE here
}

##</code><code>##

if (COND1) {
    my $var = ...
} 
if (COND2) {
    # $var OUT-OF-SCOPE here
}

##</code><code>##

if (COND1) {
    my $var = ...
    if (COND2) {
        # $var IN SCOPE here
    }
}