DB<20> p prototype "CORE::keys" \[%@] DB<21> p keys @a DB<22> p keys %a DB<23> p keys $a Experimental keys on scalar is now forbidden at (eval 32)[c:/Strawberry/perl/lib/perl5db.pl:738] line 2. Type of arg 1 to keys must be hash or array (not scalar dereference) at (eval 32)[c:/Strawberry/perl/lib/perl5db.pl:\ 738] line 2, at EOF DB<24>