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  names \code{y} also fulfill \code{is.language(y)}, see the examples.
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  names \code{y} also fulfill \code{is.language(y)}, see the examples.
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  This is a \link{primitive} function.
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  This is a \link{primitive} function.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\examples{
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\examples{
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ll <- list(a = expression(x^2 - 2*x + 1), b = as.name("Jim"),
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ll <- list(a = expression(x^2 - 2*x + 1), b = as.name("Jim"),
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           c = as.expression(exp(1)), d = call("sin", pi))
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           c = as.expression(exp(1)), d = call("sin", pi))
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sapply(ll, typeof)
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sapply(ll, typeof)