[Rd] trace creates object in base namespace if called on function argument

[Antoine Fabri]

Dear R-devel,

I don't think this is expected :

foo <- function() "hello"
trace2 <- function(fun) trace(fun, quote(print("!!!")))
base::fun
# Object with tracing code, class "functionWithTrace"
# Original definition:
# function() "hello"
#
# ## (to see the tracing code, look at body(object))

`untrace()` has the same behavior.

This is inconsistent with how debug works :

foo <- function() "hello"
debug2 <- function(fun) debug(fun)
debug2(foo)
isdebugged(foo)
# [1] TRUE

This can be worked around by defining :

trace2 <- function(fun) eval.parent(substitute(trace(fun,
quote(print("!!!")))

but I believe the current behavior is undesired and it'd be better to make
it behave as `debug()`, or to throw an error.

Best,

Antoine

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