Breakpoints

[Simon Marlow]

Pepe Iborra wrote:
> Thanks Simon, I will be looking into these asap. I'm taking a plane  
> back home tomorrow morning after some weeks abroad, so it might take  me 
> a few days to catch up.
> 
> See some more comments inlined below
> 
> On 20/12/2006, at 10:49, Simon Marlow wrote:
> 
>> Hi Pepe,
>>
>> I played around with breakpoints a little today, they seem to work  
>> pretty well - nice going!  I discovered a few minor issues that you  
>> might be able to clear up:
>>
>>   - I can't seem to set a breakpoint on 'main'.  In fact, in a file  that
>>     contains only 'main', I get:
>> *Main> :break add Main 1
>> *** Exception: Module main:Main was not loaded under debugging  mode. 
>> Enable debugging mode and reload it
>>
>>     even though I have -fdebugging turned on.
>>
> 
> This might be due to breakpoint coalescing. If there are no local  
> bindings at a site, the breakpoint is not inserted at instrumentation  
> time.
> And there is a possible explanation for the error message. It might  be 
> that in a file with no breakpoints at all, ghci erroneously  reports 
> that the file was not loaded under debugging mode, when in  fact it was.
> Should we disable this form of coalescing to minimize end user  
> confusion, or include a bold disclaimer in the manual and/or the  error 
> message?

I don't have a preference for how to do it, but I definitely think the error 
message shouldn't lie about whether the file was loaded with -fdebugging, and it 
should definitely be possible to set a breakpoint on Main.main.  If you don't 
have time to do this right now, could you file a ticket and milestone it for 6.8?

Cheers,
	Simon