hsExprType returns incorrect type for static forms
hsExprType has the clause:
hsExprType (HsStatic _ e) = lhsExprType e
but this is wrong, the type of static 0 is not Int but StaticPtr Int.
The fix is morally to instead have
hsExprType (HsStatic _ e) = mkTyConApp staticPtrTyCon (lhsExprType e)
but right now StaticPtr is not wired-in so this is a bit awkward.