Hi John,

> IIRC, George Bosworth was inspired by a paper on guardians. I don't 
> have the reference handy, but I believe that it was in an ACM SIGPLAN 
> publication. This would have been very early in the 90's.

Yes, actually I have been corresponding with both, George and Eliot about
this. From what I can tell right now there are no IP issues.

Cheers,
  - Andreas

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