R version 2.9.2 (2009-08-24)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
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  Natural language support but running in an English locale

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Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

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Type 'q()' to quit R.

[R.app GUI 1.29 (5464) i386-apple-darwin8.11.1]

> x <- function {}
Error: syntax error
> x <- function() {}
> x <- function() {
+ cat("hello")
+ cat("world")
+ }
> x
function() {
cat("hello")
cat("world")
}
> x()
helloworld
> 2 + 2
[1] 4
>