Current perlvar (look for the %SIG entry) states:

As the 'IGNORE' hook is not supported by "__WARN__", you can disable warnings using the empty subroutine: 
       local $SIG{__WARN__} = sub {};

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"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Meaning of $SIG{__WARN__}="IGNORE"; by Joost
in thread Meaning of $SIG{__WARN__}="IGNORE"; by Anonymous Monk

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