[Haskell-cafe] haskell2010 and state question.

[Brandon S Allbery KF8NH]

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On 12/9/10 20:40 , Magicloud Magiclouds wrote:
> First to notice that. So standard-wise, there is no way to do state thing?

There seems to be a lot of confusion as to what the language standard
covers.  It is a bare minimum; practical libraries are not part of its
purview, but only the minimum needed to make implementing practical
libraries possible.

This includes some baked-in assumptions:  for example, the "do" construct
requires that the Monad typeclass support a "fail" method, numeric literals
require the Num typeclass to support a "fromIntegral" method, etc., and
since you can't extend typeclasses after definition that means Num and Monad
are overspecified compared to other types in the language standard.

Take a look at the Haskell Platform for a practical compiler-and-libraries
standard.

- -- 
brandon s. allbery     [linux,solaris,freebsd,perl]      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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