gugod / gugod/App-PerlNitpick

Varibles in diamond operator are not recongnized.

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Dominant language
Perl
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Description

As title. For that reason, the rule RemoveUnusedVariables would removes `$fh` from the open statement in the following code

```
open my $fh, "<", "foo.txt";
while(<$fh>) {
...
}
```

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