From print:

If you're storing handles in an array or hash, or in general whenever you're using any expression more complex than a bareword handle or a plain, unsubscripted scalar variable to retrieve it, you will have to use a block returning the filehandle value instead...

So, just change the last line in the while loop to:

say { $handles{$file_out} } join "\t", @some_data;

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Hope that helps,

Athanasius <°(((>< contra mundum

In reply to Re: store file handles in a hash by Athanasius
in thread store file handles in a hash by llancet

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