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This function is identical to hasArg, except that it accepts the argument name as a character string. This avoids to have a check NOTE about invisible binding variable.
hasArg
hasArg2(name)
the name of an argument as a character string.
# NOT RUN { f <- function(...){ hasArg2('abc') } f(a=1) f(abc=1) f(b=1) # }
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