Re: CM error messages

Great, thanks!

Dave

Matthias Blume wrote:
> I just committed a fix for this.  It's not pretty, but I hope it will
> get the job done.  CM now raises an exception when it comes across an
> undefined anchor.  If the offending anchor occurs within another .cm
> file, then an error message (including file name and line number) is
> generated as well.
> 
> This should be available in 110.61.  Alternatively, you can get the
> latest version directly from the subversion repository.
> 
> Matthias
> 
> On Dec 4, 2006, at 3:32 PM, Dave Herman wrote:
> 
>> When the CM can't find a component, it gives very cryptic messages. I
>> didn't realize that in 110.60, the tdp-util library isn't installed by
>> default, so when I tried to use the BackTrace library, I got the
>> following error message:
>>
>> % ml-build -Ctdp.instrument=true \$smlnj-tdp/back-trace.cm  main.cm
>> Main.main main.heap
>> Standard ML of New Jersey v110.60 [built: Mon Nov 20 09:30:59 2006]
>> [scanning $smlnj-tdp/back-trace.cm]
>> /Applications/smlnj/bin/sml: Fatal error -- Uncaught exception Io  with
>> <unknown> raised at Basis/Implementation/IO/text-io-fn.sml: 784.25-784.71
>>
>> It took me a long time to uncover what was going wrong: the CM didn't
>> recognize the "smlnj-tdp" variable because that component wasn't
>> installed, and consequently replaced it with something like
>> $Undef<smlnj-tdp>. Then the system proceeded to try to find
>> $Undef<smlnj-tdp>/back-trace.cm and failed to find it, whereupon it
>> raise an Io exception. (Did I get that right?)
>>
>> It would be very useful if the CM would raise an exception indicating
>> that it doesn't recognize the variable, with an informative error
>> message indicating that a particular component needs to be installed.
>>
>> Thanks,
>> Dave
>>
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