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  1. or download this
    use warnings;

use blah;

sprintf("%d\n", 1); #this is always warned, as it is in a scope with "
+use warnings" declared
  2. or download this
    package blah;

sprintf("%d\n;", 1); 
1;
  3. or download this
    Useless use of a constant in void context at test1.pl line 5.
  4. or download this
    Useless use of a constant in void context at blah.pm line 3.
Useless use of a constant in void context at test1.pl line 5.