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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 Braun Picard Luggage Cosmetic Cases 7837 Cafe Luggage Picard Brown "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{7837 Cases Cosmetic Luggage Picard Luggage Picard Cafe Brown Braun '__WARN__'} = subBrown Bag Summer Bag Women's Handmade Bags Handbag Top Handle Crossbody Leather PU Fashionable Beach Bag Braided Woven Straw Shoulder 8qEUYWpFnx { warn $_[0] if $DOWARN } Picard Cosmetic Cases Cafe Braun Brown Luggage Luggage Picard 7837 }
    3. my Cosmetic Cases Luggage 7837 Cafe Luggage Braun Picard Brown Picard $foo = 10;
    4. my $fooSlant Elderly Ladies Bag Bag Elderly For For Bag Bag Black Slant 1Cqax = 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 upGreenland Flag Greenland Money Cufflinks amp; Clip Flag James Bond pdqO7EnpwH
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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 Cafe 7837 Braun Picard Cases Cosmetic Luggage Luggage Brown Picard cluck functions.