This function removes dead code that cannot possible be reached by the
interpreter because it comes after an explicit call to
One of the purposes of this function is to merely clean and simplify
code. We use it to remove extraneous code before compiling R code
the function whose code we analyze and clean, or an
expression or call, i.e. a
a logical value that controls whether we recursively
process each expression or just process the top-level expressions in
The modified version of the function with any extraneous code in the body removed.
Duncan Temple Lang
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