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tcfail103.hs:15:23:
Couldn't match type ‘t’ with ‘s’
‘t’ is a rigid type variable bound by
the type signature for f :: ST t Int at tcfail103.hs:10:5
‘s’ is a rigid type variable bound by
the type signature for g :: ST s Int at tcfail103.hs:13:14
Expected type: STRef s Int
Actual type: STRef t Int
Relevant bindings include
g :: ST s Int (bound at tcfail103.hs:15:9)
v :: STRef t Int (bound at tcfail103.hs:12:5)
f :: ST t Int (bound at tcfail103.hs:11:1)
In the first argument of ‘readSTRef’, namely ‘v’
In the expression: readSTRef v
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