Resolve dplyr::vars + ggplot2::vars clash

[hadley]

@lionel- can you think of some hack to avoid the dplyr::vars() + ggplot2::vars() namespace clash? (In an ideal world people wouldn't @import dplyr and @import ggplot2 but clearly there are ~100 packages that do this, and getting them all to change is going to be too much work)

[hadley]

Part of #2584

[hadley]

This hack appears to work 🙀

.onLoad <- function(...) {
  # To avoid namespace clash with dplyr
  if (requireNamespace("dplyr", quietly = TRUE)) {
    vars <<- dplyr::vars
  }
}

[lock]

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