Here's a shameless plug for a paper which also examines some related
issues and briefly talks about mutable let as well:

@InProceedings{SperberThiemann1998,
  author = 	 {Michael Sperber and Peter Thiemann},
  title = 	 {{ML} and the Address Operator},
  booktitle = 	 {1998 {ACM-SIGPLAN} Workshop on {ML}},
  crossref =	 {ML1998},
  pages =	 {4--13},
  year =	 1998
}

@Proceedings{ML1998,
      title =        "1998 {ACM-SIGPLAN} Workshop on {ML}",
      booktitle =    "1998 {ACM-SIGPLAN} Workshop on {ML}",
      year =         "1998",
      month =     sep,
      address = "Baltimore, Maryland"
}

I'll be glad to send PostScript to anyone who asks.

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla
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