If you absolutely must interpolate the constant (I'm not sure why, and what's wrong with your first solution using concatenation...), you can say: 

print "This is the package => ${\__PACKAGE__} <=";
# or 
print "This is the package => @{[__PACKAGE__]} <=";

[download]

The idea is just to create a reference to whatever you want to interpolate, and then dereference it using the double-quote-interpolated sigils ${...} or @{...}.

In reply to Re: Print the Global special constant Variable by Anonyrnous Monk
in thread Print the Global special constant Variable by aantonyselvam

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