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  1. or download this
    $ perl  import-into-warnings-notToolkit.pl
f is not init but no warning
Argument "A" isn't numeric in addition (+) at import-into-warnings-not
+Toolkit.pl line 19.
f is not a number and you're warned 0
  2. or download this
    $ perl  -W import-into-warnings-notToolkit.pl
Use of uninitialized value $f in concatenation (.) or string at import
+-into-warnings-notToolkit.pl line 17.
f is not init but no warning
Argument "A" isn't numeric in addition (+) at import-into-warnings-not
+Toolkit.pl line 19.
f is not a number and you're warned 0
  3. or download this
    #!/usr/bin/perl --
BEGIN {
    package Fake;
...


__END__