Re: [Haskell-cafe] IO vs MonadIO

On 12 September 2012 18:24, Sergey Mironov wrote:

Hi. Just a brief question. System.IO functions are defined in IO monad and have signatures like Foo -> IO Bar. Would it be better to have all of them defined as (MonadIO m) => Foo -> m Bar? What are the problems that would arise?

That would require MonadIO being defined in base, and might make some existing code fail due to lack of type signatures (though I suppose you could specify a default). -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com