Re: [Haskell-beginners] How to compile stub?

Not quite understand... You might like to parse full code to somewhere like http://hpaste.org/ and provide url.. -Haisheng On Wed, Jun 22, 2011 at 4:54 PM, Zhi-Qiang Lei wrote:

Hi,

My attempt which compiles some files with stub failed. Can you tell me how to compile them? Thanks.

PrettyJSON.hs:

renderJValue :: JValue -> Doc renderJValue (JBool True) = text "true" renderJValue (JBool False) = text "false" renderJValue JNull = text "null" renderJValue (JNumber num) = double num renderJValue (JString str) = string str

PrettyStub.hs:

import SimpleJSON

data Doc = ToBeDefined deriving (Show)

string :: String -> Doc string str = undefined

text :: String -> Doc text str = undefined

double :: Double -> Doc double num = undefined

Result:

bogon% ghc -c PrettyJSON.hs PrettyStub.hs SimpleJSON.o Warning: the following files would be used as linker inputs, but linking is not being done: SimpleJSON.o

PrettyJSON.hs:1:16: Not in scope: type constructor or class `JValue'

PrettyJSON.hs:1:26: Not in scope: type constructor or class `Doc'

PrettyJSON.hs:2:14: Not in scope: data constructor `JBool'

PrettyJSON.hs:2:29: Not in scope: `text'

PrettyJSON.hs:3:14: Not in scope: data constructor `JBool'

PrettyJSON.hs:3:29: Not in scope: `text'

PrettyJSON.hs:4:13: Not in scope: data constructor `JNull'

PrettyJSON.hs:4:29: Not in scope: `text'

PrettyJSON.hs:5:14: Not in scope: data constructor `JNumber'

PrettyJSON.hs:5:29: Not in scope: `double'

PrettyJSON.hs:6:14: Not in scope: data constructor `JString'

PrettyJSON.hs:6:29: Not in scope: `string'

Best regards, Zhi-Qiang Lei zhiqiang.lei@gmail.com

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