Well, since the E language has been mentioned above, I'll instead ask what you think of CaPerl and Safer Scripting Through Precompilation.
CaPerl is a system that implements capability discipline in Perl. It does this by introducting a few extra language constructs, and by restricting what untrusted code is allowed to do. The CaPerl language is compiled into standard Perl which can then be run by a completely standard Perl interpreter. However, untrusted code is prevented from doing anything its trusted (or untrusted) wrapper did not intend it to do.
...also these papers on capabilities, etc. might be of interest.

In reply to Re^7: Attack on Perl or Perl's need better PR (again) by Anonymous Monk
in thread Attack on Perl or Perl's need better PR (again) by wazoox

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