On 2008.08.24 01:29:18 +0200, Niels Aan de Brugh <[EMAIL PROTECTED]> scribbled 1.0K characters: > Thomas Davie wrote: >> http://games.slashdot.org/comments.pl?sid=654821&cid=24716845 >> >> Apparently, no one realises that a SEGFAULT is a type error, just not >> a very helpful one. > Right, so here's an action plan for a clueless C-programmer: > - Recompile program in debug mode. > - Start application in debugger. > - See where error happens, check out call-stack, check out local > variables and possibly some heap. > - Fix problem, repeat action plan if needed. > > Here's an error the Haskell run-time system might throw: > *** Exception: Prelude.head: empty list > (or whatever) > > So now what? Action plan = []. Perhaps Hat could help here? Or the new > GHCi debugger? As a professional C++ programmer and a free-time fan of > Haskell I'm not sure e.g. Visual Studio and the Haskell debugging tools > I've just mentioned are on the same level of usability. > > Be careful with your propaganda before you have the real-world tools to > back it up. > > Regards, > Niels, devil's advocate, never idealistic.
What do I do? In the very rare case that it isn't immediately obvious where the head is coming from, I pull out the interlude library: <http://hackage.haskell.org/cgi-bin/hackage-scripts/package/interlude>. 2 or 3 lines later, I run the binary and find out the answer. -- gwern CESID Security Delta d DUVDEVAN SRI composition data-haven SONANGOL World
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