Warn about extraneous arguments in the
... of its caller. A
utility to be used e.g., in S3 methods which need a formal
argument but do not make any use of it. This helps catching user
errors in calling the function in question (which is the caller of
“the dots”, as passed from the caller.
not yet implemented: character vector of named
Martin Maechler, first version outside base, June 2012.
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