R-alpha: stop() in batch mode.

[Thomas Lumley]

The batch mode stack imbalances appear to be confined to error reporting.
In particular the stop() command seems to trigger them.  

Solaris-gorn% more break.R
stop("Breaks R")

Solaris-gorn% ~/R49 <break.R 

R : Copyright 1997, Robert Gentleman and Ross Ihaka
Version 0.49 Beta (April 23, 1997)

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

[Previously saved workspace restored]

> stop("Breaks R")
Error: Breaks R
Execution halted
Error: stack imbalance in "unprotect"
Execution halted
stack imbalance in stop, 2 then 0
Error: stack imbalance in "unprotect"
Execution halted
Error: stack imbalance in "unprotect"
Execution halted
stop("Breaks R")
> 


Thomas Lumley
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