Simon, I discovered that the following example also won't parse in ghc-6.12.1 because of the infix 'MayOpen' constraint:
with ∷ (Resource resource, MonadCatchIO pr)
⇒ resource
→ (∀ s. s `MayOpen` resource ⇒ RegionalHandle resource (RegionT s
pr) → RegionT s pr α)
→ pr α
Is this also fixed by your previous patch?
regards,
Bas
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