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if( defined( my $r = foo() )) {
}
else {
}

open IN, $filename or die "Cannot open $filename for input: $!\n";
close IN;

open IN, $filename or die "Cannot open $filename for input: $!\n";
while( <IN> ) {

}
close IN;

open IN, $filename or die "Cannot open $filename for input: $!\n";
while( <IN> ) {
    next if //;
}
close IN;