Getting ... without evaluating it?

I'd like a function to get an unevaluated copy of its argument list, 
including ... .  That is, I'd like

f <- function(...) {
 args <- <what goes here??>
 args
}

when called as

f(a = 1+1, b = foo)

to return something like list(a = quote(1+1), b = quote(foo)).  If I use args 
<- list(...) then it tries to evaluate the arguments and dies (because foo 
doesn't exist).  If I use args <- substitute(...) then it gives just 1+1, it 
doesn't keep the names or give the whole list.

f <- function(...) as.list(match.call())[-1]
f(a = 1+1, b = foo)