Hey, I didn't know about Fatal, cool. Unfortunately it seems broken on my system:

Cannot make a non-overridable builtin fatal at /usr/share/perl/5.8/Fat
+al.pm line 108.
BEGIN failed--compilation aborted at f.pl line 1.
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I wonder, does this do anything different?

    use Fatal qw/open close/;
    my $result = do {
        open my $fh, '>', '/dev/full';
        print $fh "Foo\n";
    };
    print $result ? $result : $@, $/;
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Also it's probably worth trying to put in an extra nonces value at the end of the block, like "37", just to disambiguate the value of print from some mysterious other factor.