find module of `fromJust Nothing'

Ketil Malde ketil at
Mon Nov 13 16:14:16 EST 2006

Serge D. Mechveliani wrote:
> On Mon, Nov 13, 2006 at 12:17:07PM +0000, Simon Peyton-Jones wrote:
>> The "Maybe.fromJust: Nothing" comes from the library code itself.
>> The "Nat1" part is simply the name of the binary.  It give no clue to 
>> who called fromJust.
> I do not understand the whole idea.
> First, the same problem is for many functions:  head, tail, and others.
I often end up using CPP to #define replacements for these, using the 
__LINE__ and __FILE__ macros to identify the source of the error.


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