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  1. or download this
    $ perl -le " sub dang : lvalue { undef } dang()=1;  "
Can't return undef from lvalue subroutine at -e line 1.
...
Can't use an undefined value as an ARRAY reference at -e line 1.

$ perl -le " my $variable = undef; $variable->[0] "
  2. or download this
    ( undef, undef, my $mode ) = stat 'filename';
  3. or download this
    $ perl -le " undef = 1; "
Modification of a read-only value attempted at -e line 1.