++ and amen, but only with  no warnings 'void'; since one cannot enjoy perversity incautiously.

In fact, wouldn't any of the left-associative operators  * x + - . << >> & | ^ , => xor do as well so long as precedence levels were not mixed unwisely? Although I haven't thoroughly tested it, I like:

>perl -wMstrict -le
"$_ = 'p1r4k/8';
 my $t = 'p-r----k/--------';
 no warnings 'void';
 s/8/7-/g-+s/7/33-/g-+s/6/5-/g-+s/5/22-/g-+s/4/3-/g-+s/3/11-/g-+s/2/1-
+/g-+s/1/-/g;
 print qq{'$_'};
 print $_ eq $t;
"
'p-r----k/--------'
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