.DollarNames(x, pattern) obeys its contract
.DollarNames(x, pattern) obeys its contract

- returns completions matching pattern, allowing tab completion in
  vanilla R

rstudio/reticulate,terrytangyuan/reticulate,rstudio/reticulate,rstudio/reticulate,terrytangyuan/reticulate,terrytangyuan/reticulate,rstudio/reticulate,rstudio/reticulate