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use Moose ();
$n = 999;
print $n;

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use Moose;
$n = 999;
print $n;

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Moose does not export its sugar to the 'main' package.
Global symbol "$n" requires explicit package name at D:\WebApp\copal\copal.tmp line 2.
Global symbol "$n" requires explicit package name at D:\WebApp\copal\copal.tmp line 3.
Execution of D:\WebApp\copal\copal.tmp aborted due to compilation errors.