if ( 0 ) {
  ;
}
elsif ( die __LINE__ ) {
  ;
}

##</code><code>##

4 at buggy.pl line 1.

##</code><code>##

use warnings;
if ( 0 ) {
  ;
}
elsif ( "$_" ) {
  ;
}
__END__
Use of uninitialized value in string at buggy.pl line 2.

##</code><code>##

if ( 0 ) {
  ;
}
elsif ( 0/0 ) {
  ;
}
__END__
Illegal division by zero at buggy.pl line 4