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use strict;
use warnings;
...
# oops, handle FH is still open if an exception was thrown.
my $line = <FH>;
print "oops, FH is still open:$line\n";

use strict;
use warnings;
...
eval { fred() };
if ($@) { print "died: $@\n" }
print "ok, \$fh is auto-closed when sub fred exits (normally or via di
+e)\n";