Dear fellow Haskellers,<div><br><div>last weak my Linux machine broke down and refused to start again. I bought a new one and installed a fresh new KDE/Linux distribution (Mint/Ubuntu) and it looks and feels awesome. I also installed the Haskell platform via the default GUI installer (mintInstall).</div>
<div>But when I try to run my recovered Haskell modules again, strange things happen.</div><div><br></div><div><br></div><div>First of all, I have a module that has a line</div><div>  import System</div><div>and that used to be fine. But now, when I try to load the module in a ghci session, I get a complaint:</div>
<div>  Could not find module &#39;System&#39;</div><div>  It is a member of the hidden package &#39;haskell98-2.0.0.1&#39;</div><div>  ...</div><div>The same happens if I do a</div><div>  Prelude&gt; :m System</div><div>What is going on?</div>
<div><br></div><div><br></div><div>Secondly, I have another module that has a data type definition like this</div><div>  data (Show n, Show v, Ord n, Ord v) =&gt; Automaton n v = Automaton {</div><div>     nameSet :: Set.Set n,</div>
<div>     valueSet :: Set.Set v,</div><div>     ....</div><div>  } deriving (Show, Eq, Ord)</div><div>and that used to work fine, too. But now, I get the complaint</div><div>  Illegal datatype context (use -XDatatypeContexts): (Show n, Show v, Ord n, Ord v) =&gt; </div>
<div>But when I follow the advice and start the module file with a</div><div>  {-# LANGUAGE DatatypeContexts ... #-}</div><div>I got the opposite complaint:</div><div>  Warning: -XDatatypeContexts is depracated: It was widely considered a misfeature, and has been removed from the Haskell language.</div>
<div>How can I clean this up?</div><div><br></div><div><br></div></div><div>Cheers,</div><div>Tom</div>