>perl -le" @in = (1..5); @out = sort { $a=$b='!'; 0 } @in; print qq{@in}"
! ! ! ! !

##</code><code>##

>perl -MO=Concise -le" @in = (1..5); @out = sort { $a=$b='!'; 0 } @in; print qq{@in}"
...
e              <1> rv2av[t11] lK/1 ->f
...

##</code><code>##

pp_pos       - Adds lvalue magic
pp_substr    - Adds lvalue magic
pp_vec       - Adds lvalue magic
pp_aelem     - Extends array
pp_aelemfast - Extends array
pp_aslice    - Extends array
pp_helem     - Extends hash
pp_hslice    - Extends hash
pp_padsv     - No effect as far as I can tell
pp_rv2sv     - ???
pp_rv2av     - ???
pp_rv2gv     - ???