Whoa. That changes everything I thought I knew about ($). Come to
think of it, one of the examples that does work it written
main = print $ runST f
where f is defined separtely. So that's consistent.
I'll take a look at the references. Thanks!
Indeed. The short answer: use
runST (long expression)
rather than
runST $ long expression
when it comes to higher-ranked functions such as runST.
A longer answer:
http://www.haskell.org/pipermail/haskell-cafe/2004-December/008062.html
> let me know what i need to read to fix it myself
MLF (see Daan Leijen, A. Loeh, `Qualified types for MLF', ICFP05)
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