in reply to
The strangest use of unlink I know of
I thought it might be even more tricky still. Since %foo is empty, unlink gets an empty list. I thought that might mean that it would delete whatever is in $_ as if it got no argument, but that doesn't happen.
my $test_file = 'file_of_doom';
die 'file already exists' if -e $test_file;
system( "touch $test_file" );
die 'file not created' if ! -e $test_file;
$_ = $test_file;
my %foo = ();
print "file gone!\n" if ! -e $test_file;
As it is, I think it just does nothing.