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  1. or download this
    sub init {
    my $pkg = shift;
...
        croak "Failed to load $proto.\n";
    }
}
  2. or download this
    # in the main
my $pkg = shift;
...
    croak "Failed to load $pkg: $@\n";
}
print foobar();
  3. or download this
    # in Foo.pm
package Foo;
...
    return "Foo!"; 
}
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