[Haskell-cafe] Testing and module export lists

Brandon S. Allbery KF8NH allbery at ece.cmu.edu
Fri Feb 26 12:44:31 EST 2010

On Feb 24, 2010, at 20:51 , Ivan Miljenovic wrote:
> On 25 February 2010 11:24, Don Stewart <dons at galois.com> wrote:
>> Seriously?? Doesn't that break the module system?
> Maybe I misunderstood it; all I know is that Curt Sampson says he uses
> this kind of stuff for testing purposes by not having to export
> functions.
> See the -fwarn-unused-binds section at
> http://www.haskell.org/ghc/docs/latest/html/users_guide/options-sanity.html

As I read that, the leading underscore doesn't export anything; it  
just suppresses any "unused" warning for the symbol (which is  
consistent with the other uses of leading underscore in warnings; it's  
also consistent with binding to _ to throw a result away).

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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