You should either use
open my $fhout, '>', "./test_out.file" or die "$!";
or
open (my $fhout, '>', "./test_out.file") || die "$!";
. The code you posted is parsed as
open (my $fhout, '>', ("./test_out.file" || die "$!"));
which is definitely not what you want.
To avoid the error you reported, though, use
my ($fhout) = @_;
or
my $fhout = shift;
Also note that the ampersand sign & is not needed when calling a sub (see
perlsub).
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