In R devel, data.frame method of '$' has been removed, but this part of
"Details" section of Extract.data.frame.Rd still implies existence of the
method.
The \code{data.frame} method for \code{$}, treats \code{x} as a
list, except that (as of R-3.1.0) partial matching of \code{name} to
the names of \code{x} will generate a warning; this may become an
error in future versions. The replacement method checks
\code{value} for the correct number of rows, and replicates it if
necessary.
Statement from before R 3.1.0 could be used again:
There is no \code{data.frame} method for \code{$}, so \code{x$name}
uses the default method which treats \code{x} as a list. There is a
replacement method which checks \code{value} for the correct number
of rows, and replicates it if necessary.
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