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Re: How can I rethrow an error after recording a backtrace?


From: Clément Pit--Claudel
Subject: Re: How can I rethrow an error after recording a backtrace?
Date: Sat, 6 Aug 2016 11:24:03 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 2016-08-06 06:02, Eli Zaretskii wrote:
>> Cc: address@hidden
>> From: Clément Pit--Claudel <address@hidden>
>> Date: Fri, 5 Aug 2016 11:38:14 -0400
>>
>> On 2016-08-05 09:40, Eli Zaretskii wrote:
>>> But with -daemon, even the first invocation of emacsclient already 
>>> doesn't display the backtrace, right?  So there's still something 
>>> different between these two use cases.
>>
>> Well, it depends what you mean by "display the backtrace": the server 
>> doesn't respect debug-on-error
> 
> Why doesn't it?  Isn't that already a bug?

I think you confirmed that it was in the other "Backtraces on server?" thread?

>> but if I register my own debugger, then I *can* capture the first backtrace. 
>> I have attached a file cpc-server.el that will explain the issue better than 
>> I can explain it in words (thanks for your patience!). Here's how it's used:
> 
> So you are saying that the problem is the daemon doesn't increment
> num-nonmacro-input-events for each new connection?  That should be
> easy enough to fix, isn't it?

Yes, but I fear it wouldn't cover the following case:

(condition-case err1 
    (condition-case err2
        (error "A")
      (error (error "B)))
  (error (message "Oups")))

Only the first error would be captured by the debugger.

Clément.

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