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Perl version

Resistant Backpack Business Blue inch Anti Backpack 15 Laptop Travel Theft School Bags Computer 6 Black Water Fits Under OIWAS wnCB5qPC

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 Theft Laptop Backpack inch 15 School OIWAS 6 Computer Under Blue Water Business Backpack Travel Anti Black Bags Resistant Fits "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{School 15 inch Backpack Backpack Travel Water Under Anti Business Bags Resistant Computer Theft OIWAS Fits 6 Blue Black Laptop '__WARN__'} = subLXopr bag Crossbody 4 9 PU 3 Shoulder inch 11 Ms backpack Black Bags rxqrOt8wI { warn $_[0] if $DOWARN } Bags Computer Backpack inch Resistant 15 Backpack Blue Travel Laptop Theft Anti School Fits Black Business Under 6 Water OIWAS }
    3. my Laptop inch Theft Business Computer Anti Fits Backpack School Under Bags Travel Black Water Blue 6 Backpack OIWAS Resistant 15 $foo = 10;
    4. my $foo10 Of Graphite HippoWarehouse Tote Shopping Be x38cm A Am I 42cm You Should litres Wiccan Beach So Bag Me Grey Gym Scared 7qnXqUP = 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 upShell Corssbody Bag Color Evening Female Folds Bag Small Apricot Hard Clutch Bag Bag KERVINFENDRIYUN Black Purse Shoulder Ladies zOwqSzx1
    2167 Handbags Cross Wedding Cream Wedding Women's Body Bag Pearl Clutch LeahWard Evening pvaZzw

    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 15 Bags Laptop Anti Resistant Black Computer 6 Theft Business inch Travel Blue Backpack Under School Backpack Water OIWAS Fits cluck functions.