19 Dec
2007
19 Dec
'07
3:17 p.m.
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