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  1. or download this
    #!/usr/bin/env perl

...

print "a::x = ", $a::x, "\n"; # Fine
print "a::z = ", $a::z, "\n"; # want to raise error here
  2. or download this
    Name "a::z" used only once: possible typo at ./647879.pl line 13.
a::x = 1
Use of uninitialized value in print at ./647879.pl line 13.
a::z =