[Rd] Strange error message

[Terry Therneau]

 I'm testing out some changes to survreg and got the following output, the
likes of which I've never seen before:

----------------------------------------------------------------------
R version 2.7.1 (2008-06-23)
Copyright (C) 2008 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

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Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> source('setup.s')
> source('mktest1.s')
> fit1w <- survreg(Surv(time, status) ~x, test1, dist='weibull')
Warning: stack imbalance in '.Call', 26 then 27
Warning: stack imbalance in '<-', 24 then 25
Warning: stack imbalance in '{', 22 then 23
Warning: stack imbalance in 'if', 20 then 21
Warning: stack imbalance in '.Call', 23 then 24
Warning: stack imbalance in '<-', 21 then 22
Warning: stack imbalance in '{', 18 then 20
Warning: stack imbalance in '<-', 12 then 14
Warning: stack imbalance in 'if', 10 then 12
Warning: stack imbalance in '{', 8 then 10
Warning: stack imbalance in '<-', 2 then 4
> traceback()
No traceback available 
----------------------------------------------------------

  The "setup" file simply attaches the directory containing my test version of
the survival code, and mktest1.s is
   test1 <- data.frame(time=  c(4, 3,1,1,2,2,3),
                    status=c(1,NA,1,0,1,1,0),
                    x=     c(0, 2,1,1,1,0,0))

the simple test data set from the appendix of my book, for which I know ALL the
answers.

  There has been a change to the C code.  Is this possibly due to a messed up
calling chain?  I've converted from "Chambers" style callback to Rinternals
style (much cleaner and less mysterious), and the result works well in Splus.
I thought I'd made it through the hard part....

  Hints appreciated, after which I can give more details.

	Terry Therneau