[Haskell-cafe] How to make Prelude.read: no parse more verbose ...

Jeff Polakow jeff.polakow at db.com
Wed Dec 19 15:28:27 EST 2007


  You can also just use reads which returns a list of (partial) parses. 


haskell-cafe-bounces at haskell.org wrote on 12/19/2007 03:17:39 PM:

> Hi
> > > Well, how do I compile a Haskell program in such a way, that I
> > > get a useful error message from read? I mean, like the
> > > filename/linenumber of the calling expression for starters.
> I use the Safe library to do this sort of stuff:
> http://www-users.cs.york.ac.uk/~ndm/safe/
> You can call readMay to get a maybe result, or readNote which gives an
> augmented error message on a crash. You can of course combine this
> with the CPP trick:
> #define read readNote (__FILE__++":"++show __LINE__)
> Thanks
> Neil
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