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my @x = ('A','B');

...
print "-------------------\n";
print "[foo", scalar(@x[0..-1]), "]\n";
print "-------------------\n";

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Use of uninitialized value in print at ./663945.pl line 9.
...
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[foo[foo]
-------------------

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Use of uninitialized value in print at ./663945.pl line 9.
...
Use of uninitialized value in print at ./663945.pl line 15.
[foo]
-------------------

print "-------------------\n";
print "[foo", scalar(('A','B')[0..2]), "]\n";
...
print "-------------------\n";
print "[foo", scalar(('A','B')[0..-1]), "]\n";
print "-------------------\n";

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Use of uninitialized value in print at ./663945.pl line 26.
...
Argument "[foo" isn't numeric in list slice at ./663945.pl line 32.
[fooA]
-------------------

print "-------------------\n";
print 2,  scalar(('A','B')[0..-1]), "]\n";  # elem at index 2 (undef)
...
print "-------------------\n";
print -3, scalar(('A','B')[0..-1]), "]\n";  # elem at index -3 (undef)
print "-------------------\n";

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Use of uninitialized value in print at ./663945.pl line 37.
...
Use of uninitialized value in print at ./663945.pl line 47.
-3]
-------------------