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  As an object of mode \code{"expression"} is a list, it can be
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  As an object of mode \code{"expression"} is a list, it can be
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  subsetted by \code{[}, \code{[[} or \code{$}, the latter two extracting
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  subsetted by \code{[}, \code{[[} or \code{$}, the latter two extracting
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  individual calls etc.  The replacement forms of these operators can be
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  individual calls etc.  The replacement forms of these operators can be
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  used to replace or delete elements.
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  used to replace or delete elements.
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  \code{expression} and \code{is.expression} are \link{primitive} functions.
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  \code{expression} and \code{is.expression} are \link{primitive} functions.
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  \code{expression} is \sQuote{special}: it does not evaluate its arguments.
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  \code{expression} is \sQuote{special}: it does not evaluate its arguments.
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}
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}
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\value{
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\value{
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  \code{expression} returns a vector of type \code{"expression"}
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  \code{expression} returns a vector of type \code{"expression"}