or download this
$ perl -v
This is perl 5, version 28, subversion 1 (v5.28.1) built for x86_64-li
+nux
...
Experimental keys on scalar is now forbidden at -e line 1.
Type of arg 1 to keys must be hash or array (not scalar dereference) a
+t -e line 1, at EOF
Execution of -e aborted due to compilation errors.