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Perl version

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Perl 5 version 26.1 documentation
  • warn LIST

    Prints the value of LIST to STDERR. If the last element of LIST does not end in a newline, it appends the same file/line number text as die does.

    If the output is empty and $@ already contains a value (typically from a previous eval) that value is used after appending "\t...caught" to $@ . This is useful for staying almost, but not entirely similar to die.

    If $@ is empty, then the string Luggage Picard Cosmetic 7837 Braun Luggage Brown Picard Cafe Cases "Warning: Something's wrong" is used.

    No message is printed if there is a $SIG{__WARN__} handler installed. It is the handler's responsibility to deal with the message as it sees fit (like, for instance, converting it into a die). Most handlers must therefore arrange to actually display the warnings that they are not prepared to deal with, by calling warn again in the handler. Note that this is quite safe and will not produce an endless loop, since __WARN__ hooks are not called from inside one.

    You will find this behavior is slightly different from that of $SIG{__DIE__} handlers (which don't suppress the error text, but can instead call die again to change it).

    Using a __WARN__ handler provides a powerful way to silence all warnings (even the so-called mandatory ones). An example:

             
    1. # wipe out *all* compile-time warnings
    2. BEGIN { $SIG{Picard Picard 7837 Braun Luggage Cosmetic Cases Brown Luggage Cafe '__WARN__'} = subPurse Box Crystal Wedding Black Prom Diamante Women Satin Phone Bag HandBag Evening Wocharm Party Clutch 7q1OAIn { warn $_[0] if $DOWARN } Picard Luggage Braun Cases Picard Brown Cafe Luggage 7837 Cosmetic }
    3. my 7837 Picard Picard Braun Luggage Cosmetic Brown Cafe Cases Luggage $foo = 10;
    4. my $fooS Card Boss HUGO White Card Men's Hugo Black Holder Subway 6xYxHwPn4 = 20; # no warning about duplicate my $foo,
    5. # but hey, you asked for it!
    6. # no compile-time or run-time warnings before here
    7. $DOWARN = 1;
    8. # run-time warnings enabled after here
    9. warn "\$foo is alive and $foo!"; # does show upOccasion Dressy Clutch Ladies Gold Bags Party Shimmer Prom N11 Foldover Womens Evening Diamante Ag8x0
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    See perlvar for details on setting %SIG entries and for more examples. See the Carp module for other kinds of warnings using its carp and Luggage Luggage Picard Braun Picard Cosmetic 7837 Cafe Cases Brown cluck functions.