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  1. or download this
    use warnings;
    use strict;
    ...
    
    warn "blah blah warning\n";
    warn "A thread exited...\n";
    
  2. or download this
    blah blah warning
    
  3. or download this
    perl -E '$SIG{__WARN__}=sub{say "handler";warn $_[0] if $_[0]!~/^A thr
    +ead/}; warn "blah"; warn "A thread";'
    handler
    blah at -e line 1.
    handler