catf(), messagef(), warningf() and stopf() are wrappers around base::cat(),
base::message(), base::warning() and base::stop(), respectively.
catf(msg, ..., file = "")messagef(msg, ...)
warningf(msg, ...)
stopf(msg, ...)
:: character(1)
Format string passed to base::sprintf().
:: any
Arguments passed down to base::sprintf().
:: character(1)
Passed to base::cat().