Hmm, Perl 5.8.9 gives me 

$ perl -MO=Deparse -e 'tied sub {}->()'
tied {sub {
    
}
}->();
-e syntax OK

[download]
which gives a different error: 
$ perl -e 'tied { sub {} }->()'
Not a subroutine reference at -e line 1.

[download]

The code you mention doesn't compile: 

$ 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.

[download]

Thanks for taking the time to think about this. I've cut and pasted these straight from the command line to avoid further incidents. :-)

In reply to Re^2: tied, or modified? by JadeNB
in thread tied, or modified? by JadeNB

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