[Haskell-cafe] "shadowing" keywords like "otherwise"

[Kim-Ee Yeoh]

Hi Vasili,

This isn't really a shadowing/redefinition issue. Here's 
a perfectly legitimate snippet that compiles fine:

f 0 = 0
f otherwise = 1+otherwise

Redefinition is when you have:

g = let otherwise = not in x 


-- Kim-Ee


VasiliIGalchin wrote:
> 
> swishParse :: String -> String -> SwishStateIO (Maybe RDFGraph)
> swishParse fnam inp =
>     do  { fmt <- gets $ format
>         ; case fmt of
>             N3        -> swishParseN3 fnam inp
>             otherwise ->
>                 do  { swishError ("Unsupported file format: "++(show fmt))
> 4
>                     ; return Nothing
>                     }
>         }
> 
> I am receiving a shadow warning:
> 
> Swish/HaskellRDF/SwishCommands.hs:304:12:
>     Warning: Defined but not used: `otherwise'
> 
> It seems to me that in the code base somewhere that there is a "redefine"
> of
> the keyword"otherwise". I haven't read the Haskell 98 Report but I thought
> that it was not possible to redefine keywords. ??
> 

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