>perl -e "%hash++";
Can't modify hash dereference in postincrement (++) at -e line 1, near "%hash++"
Execution of -e aborted due to compilation errors.

##</code><code>##

>perl -le "$r=bless({},''); print $r; printf '%x', ($r+1)-1"
main=HASH(0x1abefa0)
1abefa0