I am new to Perl, so please excuse me for asking such a simple
question: The book I am reading gave an example of how to use the
"_PACKAGE_" token. The original code is like this:
package My::Module;
print _PACKAGE, "\n";
package My::Module::Heavy;
print _PACKAGE,"\n";

When I tried to run this code using Perl version 5.10.0, I encoutered
an error message, saying "No comma allowed after file handle". But
after I changed the code to: print "_PACKAGE_\n", all I got is
_PACKAGE printed out on the screen. It appears that the _PACKAGE_ is
just like a string if "use strict" is not enforced. Can anyone explain
why is this? Thank you very much.