[ESS-bugs] tracebug problem: debug() --> from [2] to [36] !!!

[Vitalie Spinu]

Hi Martin, 

Could you please print the call stack (C-c ~) next time this happens?

It is not really an ess-tracebug problem. From your report I see it's a
help request that fails.  That can mean that our help is not full poof
or R really enters calls that it should not enter. Most likely the
second. I have reported it long ago on R devel.

See http://comments.gmane.org/gmane.emacs.ess.general/7378

and http://comments.gmane.org/gmane.comp.lang.r.devel/33522


Tracebug doesn't do anything behind your back really. You shouldn't
blame it so easily ;)

  Vitalie


 >>> Martin Maechler on Fri, 25 Oct 2013 09:14:08 +0200 wrote:

 > I'm debugging an S3 method for "dummy.coef",
 > I'm working inside *R* exclusively.

 > Earlier I had

 >> debug(robustbase:::dummy.coef.lmrob)

 > and then called  dummy.coef(<lmrob object>)
 > and hence entered the debugger correctly.

 > Now watch this

 >  Browse[2]> 
 >  Browse[2]> debug(NextMethod)
 >  Browse[2]> rr <- NextMethod("dummy.coef", object, ...)
 >  debugging in: NextMethod("dummy.coef", object, ...)
 >  debug: .Internal(NextMethod(generic, object, ...))
 >  Browse[36]> 

 > Note the '[36]' !!!!
 > I'm 36 levels (yes, and for some reaons the levels are always
 >        	      "multiplied by 2", so it is ``only'' 18 levels ...)
 > inside a call even though I only entered one
 > function.

 > And indeed, it's no joke:
 > I can painfully go back level after level :

 > Browse[36]> c
 > Error in NextMethod("dummy.coef", object, ...) : object not specified
 > Browse[34]> c
 > exiting from: NextMethod("[")
 > debugging in: NextMethod(.Generic)
 > debug: .Internal(NextMethod(generic, object, ...))
 > Browse[34]> c
 > exiting from: NextMethod(.Generic)
 > (list "base" '(("generic" . "NULL") ("object" . "NULL") ("..." . "")) '("generic" "object" "..."))
 > Browse[32]> c
 > exiting from: NextMethod("[")
 > debugging in: NextMethod(.Generic)
 > debug: .Internal(NextMethod(generic, object, ...))
 > Browse[32]> c
 > exiting from: NextMethod(.Generic)
 > (list "base" '(("generic" . "NULL") ("object" . "NULL") ("..." . "")) '("generic" "object" "..."))
 > Browse[30]> c

 > This is really ess-tracebug's failure and does not happen if I
 > use R outside ESS.

 > I've -- quite rarely -- seen this before, but not recently, so I
 > had thought this was a temporary glitch in ess-tracebug, but it
 > seems not.

 > Vitalie ?

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