error stack traces/source locations

Isaac Dupree ml at
Sat May 23 19:11:17 EDT 2009

Claus Reinke wrote:
> the mapException approach

I'm afraid it won't work as you hope for functions that return lazy data 
structures.  The 'evaluate' implicit in mapException only catches 
top-level errors/exceptions, like 'seq' and not like 'deepSeq'.


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