\Header{Paren}{Parentheses and Braces}
\keyword{programming}{Paren}
\begin{Description}\relax
Open parenthesis, \code{(}, and open brace, \code{\{}, are
\code{\Link{.Primitive}} functions in \R.

Effectively, \code{(} is semantically equivalent to the identity
\code{function(x) x}, whereas \code{\{} is slightly more interesting,
see examples.\end{Description}
\begin{Usage}
\begin{verbatim}
( ... )

{ ... }
\end{verbatim}
\end{Usage}
\begin{SeeAlso}\relax
\code{\Link{if}}, \code{\Link{return}}, etc for other objects used in
the \R{} language itself.\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
f <- get("(")
e <- expression(3 + 2 * 4)
f(e) == e           # TRUE

do <- get("{")
do(x_ 3, y_ 2*x-3, 6-x-y); x; y
\end{ExampleCode}
\end{Examples}

