Re: comint-interrupt-subjob not quite working

[Rusi]

On Saturday, September 5, 2015 at 8:10:48 AM UTC+5:30, Rusi wrote:
> On Friday, September 4, 2015 at 7:31:57 PM UTC+5:30, Rusi wrote:
> > I have a comint-mode running gofer (tiny version of Haskell)
> > 
> > When the output is large I get
> > error in process filter: Invalid regexp: "Regular expression too big"
> > error in process filter: comint-output-filter: Invalid regexp: "Regular 
> > expression too big"
> > 
> > repeated 100s of times (in *Messages* )
> > 
> > C-c C-c (comint-interrupt-subjob) has no effect
> > 
> > Now if gofer is run outside emacs C-c works and interrupts it correctly
> > Likewise if run under emacs if there is nothing untoward happening emacs
> > passes on the interrupt correctly
> > 
> > However if there is this runaway behavior then emacs stops passing it to 
> > inferior
> > process
> > 
> > Killing gofer from outside gives back control to emacs
> 
> And now (setq comint-prompt-regexp "")
> makes emacs dump core but cant reliably reproduce.
> 
> So what should it be if the prompt is "? " (at bol of course)?

Also 
comint-use-prompt-regexp
is nil. So why does comint-prompt-regexp signify?