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C:\path>perl -v | find "This is"
This is perl 5, version 28, subversion 0 (v5.28.0) built for MSWin32-x
+64-multi-thread

C:\path>type return_hash_keys.pl
use strict;
...
7           <0> pushmark s ->8
8           <0> padav[@x:6,7] lRM*/LVINTRO ->9
return_hash_keys.pl syntax OK

C:\path>type return_hash_ref.pl
use strict;
...
d           <0> pushmark s ->e
e           <0> padav[@x:7,8] lRM*/LVINTRO ->f
return_hash_ref.pl syntax OK