The problem is at least as old as 2.5.1. Looks like a line disappeared
from trace(), something like:
on.exit(tracingState(tState))
As a result, if an error occurs in the call to trace(), the tracing
state is left FALSE. The workaround is to turn it on explicitly:
tracingState(TRUE)
a
trace() seems to be broken in 2.6.1 and R-devel:
Try the example from the ?debug man page:
> library(methods)
> trace("plot", browser, exit=browser, signature = c("track",
+ "missing"))
Error in getFunction(what, where = whereF) : no function "plot" found
Okay, it's just an example that
