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  \code{is.call} is used to determine whether \code{x} is a call (i.e.,
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  \code{is.call} is used to determine whether \code{x} is a call (i.e.,
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  of mode \code{"call"}).
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  of mode \code{"call"}).
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  %NO We don't differentiate between expressions and function calls.
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  %NO We don't differentiate between expressions and function calls.
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  %NO So \code{is.call} is the same as \code{is.expression}.
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  %NO So \code{is.call} is the same as \code{is.expression}.
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  It is generic: you can write methods to handle
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  It is generic: you can write methods to handle
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  of specific classes of objects, see \link{InternalMethods}.
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  specific classes of objects, see \link{InternalMethods}.
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  Objects of mode \code{"list"} can be coerced to mode \code{"call"}.
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  Objects of mode \code{"list"} can be coerced to mode \code{"call"}.
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  The first element of the list becomes the function part of the call,
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  The first element of the list becomes the function part of the call,
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  so should be a function or the name of one (as a symbol; a quoted
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  so should be a function or the name of one (as a symbol; a quoted
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  string will not do).
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  string will not do).