Syntactically valid names
That's two different issues:
y <- list() y$... <- 2 y$..2 <- 3 y$break <- 4
Error: unexpected 'break' in "y$break" Notice that there is nothing _syntactically_ wrong with ... & friends as names:
quote(...<-4)
... <- 4 It's the _evaluator_ that throws the error because the ...-name has a special interpretation.
Oh good point. Thanks for the clarification. Hadley
Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/