## exercise sort builtins... ($a <=> $b already tested)
@a = ( 5, 19, 1996, 255, 90 );
-@b = sort { $b <=> $a } @a;
+@b = sort {
+ my $dummy; # force blockness
+ return $b <=> $a
+} @a;
print ("@b" eq '1996 255 90 19 5' ? "ok 30\n" : "not ok 30\n");
print "# x = '@b'\n";
$x = join('', sort { $a cmp $b } @harry);