[Haskell-cafe] Lazy ST test code

[David Feuer]

I've come up with what might be a fix for a major thread safety bug in lazy
ST. Fixing it involved making multiple non-trivial changes to a number of
basic functions. Unfortunately, the GHC test suite barely touches lazy ST.
Does anyone out there have some code that uses lazy ST in interesting ways
but that only relies on the libraries that ship with GHC?
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