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C:\test>type t-Moose.pl
#! perl -slw
...
SCALAR(0x229cd4)
12345

C:\test>type t-Moose.pl
#! perl -slw
...
Use of uninitialized value in print at t-Moose.pl line 14.

Can't use an undefined value as a SCALAR reference at t-Moose.pl line 
+15.