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The .DollarNames method for the GlobalOptionsFun class
# S3 method for GlobalOptionsFun .DollarNames(x, pattern = "")
the object returned by set_opt or setGlobalOptions.
set_opt
setGlobalOptions
pattern, please ignore it.
This makes the option object looks like a list that it allows option name completion after $.
$
# NOT RUN { # There is no example NULL # }
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