[R] Getting ... as an unevaluated list

[hadley wickham]

Hi,

I'm trying to get ...as a list of unevaluated arguments, ie. 
substitute(list(...)) gives me an unevaluated list of the arguments,
but I want a list of the unevaluated arguments.

My attempts so far:

(function(...) substitute(...))(a=1, b=a)  # Only returns first

(function(...) substitute(list(...)))(a=1, b=a) # Unevaluated list,
not list of unevaluated

(function(...) expression(...))(a=1, b=a)

(function(...) eval(expression(...)))(a=1, b=a)  # Error in eval(expr,
envir, enclos) : ... used in an incorrect context

(function(...) substitute(expression(...), list(...)))(a=1, b=a) #
Error in (function(...) substitute(expression(...), list(...)))(a = 1,
 : Object "a" not found

What I actually want: list(1, a)

Can anyone offer any suggestions?

Thanks,

Hadley