R feature request: stop(..) should print its caller call

[Kurt Hornik]

>>>>> Martin Maechler writes:

> The following shows what I mean:
> tst<-function(x)in.tst(x); in.tst<-function(y)stop(paste("y is",y)); tst(pi)

> in R gives

> --------------------
> Error: y is 3.141593
> --------------------

> in S-plus gives

> ----------------------------------------
>> > Error in in.tst(x): y is 3.14159265358979
> Dumped    ^^^^^^^^^^^^
> ----------------------------------------

> For locating bugs / problems in functions, it would be tremendously
> helpful if R also printed the name of the function from which it is
> called (actually the ``call(..)'' rather than just the function name).

Martin,

I am not sure.  I find it more useful to call traceback() after an error
occurred to find out what really happened.

-k
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