[Haskell-cafe] TH error

[Mitchell, Neil]

Hi Tim,

You seem to be duplicating the functionality of Data.Derive to some
extent:

http://www.cs.york.ac.uk/~ndm/derive/

You might find it easier to use that tool, and if it doesn't meet your
needs send in a patch :-)

Thanks

Neil 

> -----Original Message-----
> From: haskell-cafe-bounces at haskell.org 
> [mailto:haskell-cafe-bounces at haskell.org] On Behalf Of Tim Newsham
> Sent: 27 September 2008 3:34 am
> To: haskell-cafe at haskell.org
> Subject: [Haskell-cafe] TH error
> 
> I'm goofing with TH and I have my program mostly done:
> 
>      http://hpaste.org/10713
> 
> If I have the "$(deriveBinary ''MyData)" line commented out 
> it prints out what looks to me like correct code.  I can even 
> paste it into a program and it compiles.  However, when the 
> line isn't commented out I get an error I don't understand:
> 
>      test.hs:1:0:
>          Illegal data constructor name: `x'
>          When splicing generated code into the program
> 
> There are two places in my code I use "x" in splices that 
> could be causing the problem:
> 
>      g <- [| getWord8 >>= \x -> $(caseE [| x |] gcases') |] and
>                put x = $(caseE [| x |] (map return ps)) |]
> 
> but I don't understand why these might be causing errors (if 
> they are indeed the cause).  Using -ddump-splices doesn't 
> help since it seems to hit the error before dumping splices.
> 
> What's going on here?
> 
> Tim Newsham
> http://www.thenewsh.com/~newsham/
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> Haskell-Cafe at haskell.org
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> 
> 

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