What about "users :: ToJson a => a"? On Tue, Oct 4, 2011 at 12:42 AM, Magicloud Magiclouds < magicloud.magiclouds@gmail.com> wrote:
Hi, I have a function: post :: (ToJson p, FromJson q) => String -> String -> String -> Map.Map String p -> IO q Now I'd like to call it like: r <- post site token "user.addMedia" (Map.fromList [ ("users", users :: ToJson) , ("medias", medias :: ToJson) ]) So I got the problem. If I used things like "users :: ToJson", then class used as a type error occurred. But if I did not use them, since users and medias were actually different types, then fromList failed, required the type of medias the same with users.
How to resolve the conflict? -- 竹密岂妨流水过 山高哪阻野云飞
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