name corresponds to an argument in the
call, either a formal argument to the function, or a component of
The name of a potential argument, as an unquoted name or character string.
hasArg(x), for example, is similar to
!missing(x), with two exceptions. First,
hasArg will look for
an argument named
x in the call if
x is not a formal
argument to the calling function, but
... is. Second,
hasArg never generates an error if given a name as an argument,
missing(x) generates an error if
x is not a
FALSE as described above.
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