[Haskell-beginners] How to interpret the definition of MonadState

[Daniel Fischer]

On Tuesday 07 June 2011, 17:35:45, djp at arqux.com wrote:
> Does that mean it's ghc specific, i.e. not in Haskell 98 / 2010?

It's not in haskell98 or haskell2010, but I think hugs also supports 
functional dependencies (however, hugs is pretty much dead, last release 
September 2006). I don't know which extensions other compilers support, not 
even which of them should be considered alive.