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No -XNoMonomorphismRestriction: GHC.Prim.Any * types show up #2

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xnyhps opened this issue May 4, 2012 · 0 comments
Open

No -XNoMonomorphismRestriction: GHC.Prim.Any * types show up #2

xnyhps opened this issue May 4, 2012 · 0 comments
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xnyhps commented May 4, 2012

Without -XNoMonomorphismRestriction, the type of the module:

f = _?h >>= _?g

is found to be:

f :: GHC.Prim.Any (* -> *) (GHC.Prim.Any *)

(Even when interpreting GHC.Prim.Any * as forall a. a, this is incorrect as the Monad constraint is not on the first * -> *)

With -XNoMonomorphismRestriction, the type is correctly:

f :: Monad m => m b
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