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tcfail103.hs:15:13:
Couldn't match type `s' with `t'
`s' is a rigid type variable bound by
the type signature for g :: ST s Int at tcfail103.hs:15:9
`t' is a rigid type variable bound by
the type signature for f :: ST t Int at tcfail103.hs:11:1
Expected type: ST s Int
Actual type: ST t Int
In the return type of a call of `readSTRef'
In the expression: readSTRef v
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