library(MASS)

library(dplyr)
mtcars %.%
select(mpg)

# Error in select(`__prev`, mpg) : unused argument (mpg)

require(MASS)
require(dplyr)
mtcars %>%
   dplyr::select(mpg)

detach("package:dplyr", character.only = TRUE)
library("dplyr", character.only = TRUE)

devtools::install_github("rubenarslan/formr")

library (MASS)
library (dplyr)

select(mtcars, mpg)

dplyr::select(mtcars, mpg)

select <- dplyr::select
filter <- dplyr::filter

library(MASS)
select

  function (obj)
  UseMethod("select")
  <bytecode: 0x7fbe822811b8>
  <environment: namespace:MASS>

select <- dplyr::select
select

  function (.data, ...)
  {
      UseMethod("select")
  }
  <bytecode: 0x7fbe7c4a2f08>
  <environment: namespace:dplyr>