> Then we get the problem when we use difST in distString.
I no such problem.
The Glorious Glasgow Haskell Compilation System, version 6.3
ghc -H32m -Wall -O2 -fvia-C -optc-O2 -optc-march=pentium3 -optc-mfpmath=sse
-fexcess-precision -fliberate-case-threshold100 -funbox-strict-fields -threaded -c
Diff.hs -i../.. -syslib net +RTS -K100000000
Diff.hs:
Warning: Module `Data.Array.MArray' is imported, but nothing from it is used
(except perhaps instances visible in `Data.Array.MArray')
Diff.hs:159:13: Warning: Defined but not used: br
...??...
Of course the obvious way to have somewhere to put the class is
to turn the let into a function:
for example like:
distString :: String -> String -> Int
distString s0 s1 = f (runST (difST s0 s1))
f :: IArray a Int => a (Int,Int) Int -> Int
f a = a!(1,1)
... or a non polymorphic version:
f :: UArray (Int,Int) Int -> Int
f a = a!(1,1)
Keean.
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