[Haskell-cafe] Hackage bug? Autobuild failure on literate source with ignored code blocks.

Brandon S. Allbery KF8NH allbery at ece.cmu.edu
Mon Sep 28 14:08:08 EDT 2009

On Sep 28, 2009, at 12:21 , Duncan Coutts wrote:
> On Sun, 2009-09-27 at 21:06 +0100, John Millikin wrote:
>> According to <http://www.haskell.org/haskellwiki/ 
>> Literate_programming>,
>> the following should compile properly because the second block of  
>> code
>> will be ignored by GHC:
>> \begin{code}
>> main = putStrLn "Hello world!"
>> \end{code}
>> \begin{code}%
>> main = -- TODO
>> \end{code}%
> It looks to me like the advice on that wiki page is incorrect.
> The Haskell98 report states:
>        An alternative style of literate programming is particularly
>        suitable for use with the LaTeX text processing system. In this
>        convention, only those parts of the literate program that are
>        entirely enclosed between \begin{code}...\end{code} delimiters
>        are treated as program text; all other lines are comment. More
>        precisely:
>              * Program code begins on the first line following a line
>                that begins \begin{code}.
>              * Program code ends just before a subsequent line that
>                begins \end{code} (ignoring string literals, of  
> course).
> The key phrases is "a line that begins \begin{code}". In other  
> words, a
> line "\begin{code}%" does indeed begin a code block.

Isn't the better solution to this something like

then use \begin{uncode} .. \end{uncode} ?

(depends on how the code environment is defined)

brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH

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