On 10/3/13 6:50 AM, Stefan Monnier wrote:
>> but instead explicitly set and reset it, skipping the reset if the
>> value changed while we evaluated the form. I've also added a flush
>> timer so that we don't need to wait for a while line of output to
>> accumulate before displaying output.  (Imagine a loop that calls
>> (princ ".") occasionally to indicate progress.)
> 
> I'm curious: why go through this trouble instead of just setting it
> buffer-locally at the beginning and forgetting about it?

Because then I can't work with code that operates in a different buffer
and outputs debug tracing to standard-output.