clarification on srcref and function f

[piccolbo]

I was wondering if there is a simple explanation why functions created with function have a srcref attribute, whereas function created with f don't, but their bodies do. To add a touch of mystery, using f in a do.call inside another function makes even the body attributes go away. That means it's hard to use covr with pryr as the srcref attribute is used in that library. It'd be nice if function and f were absolutely interchangeable, in an ideal world. Thanks

library(pryr)
fplain = function(x) {x}
ff = f(x, {x})
f.do.call = function(...) do.call(f, c(dots(...), .env = parent.frame()))
fff = f.do.call(x, {x})
attributes(fplain)
# $srcref
# function(x) {x}
attributes(ff)
# NULL
attributes(fff)
# NULL
attributes(body(fplain))
# $srcref
# $srcref[[1]]
# {
# $srcref[[2]]
# x
# $srcfile
# $wholeSrcref
# fplain = function(x) {x}
attributes(body(ff))
# $srcref
# $srcref[[1]]
# {
# $srcref[[2]]
# x
# $srcfile
# $wholeSrcref
# ff = f(x, {x}
attributes(body(fff))
# NULL

[piccolbo]

it seems dots exacts an attribute tax