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T8428.hs:11:19: error:
• Couldn't match type: (forall s. ST s) a
with: forall s. ST s a
Expected: IdentityT (forall s. ST s) a -> forall s. ST s a
Actual: IdentityT (forall s. ST s) a -> (forall s. ST s) a
• In the second argument of ‘(.)’, namely ‘runIdentityT’
In the expression: runST . runIdentityT
In an equation for ‘runIdST’: runIdST = runST . runIdentityT
• Relevant bindings include
runIdST :: IdentityT (forall s. ST s) a -> a
(bound at T8428.hs:11:1)
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