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  1. or download this
    $ perl -MO=Deparse -e 'tied sub {}->()'
tied {sub {
...
}
}->();
-e syntax OK
  2. or download this
    $ perl -e 'tied { sub {} }->()'
Not a subroutine reference at -e line 1.
  3. or download this
    $ perl -e 'tied { sub {}->() }'
Can't modify anonymous hash ({}) in tied at -e line 1, at EOF
Execution of -e aborted due to compilation errors.