Problem with how enquo() is copied from rlang

[romainfrancois]

When testing package bruceR, we get this error that is caused by jmvcore:

> checking examples ... ERROR
  Running examples in ‘bruceR-Ex.R’ failed
  The error most likely occurred in:
  
  > ### Name: Alpha
  > ### Title: Reliability analysis (Cronbach's alpha and McDonald's omega).
  > ### Aliases: Alpha
  > 
  > ### ** Examples
  > 
  > # ?psych::bfi
  > Alpha(bfi, "E", 1:5)  # "E1" & "E2" should be reverse scored
  Warning: replacing previous import ‘ggplot2::enquo’ by ‘jmvcore::enquo’ when loading ‘jmv’
  Error in jmvcore::enquo(vars) : object 'rlang_enquo' not found
  Calls: Alpha -> <Anonymous> -> <Anonymous> -> <Anonymous>
  Execution halted

1 error x | 0 warnings ✓ | 0 notes ✓

This is because enquo is defined as follows here:

#' rlang::enquo
#' Simplifies things so packages overriding Analysis don't need
#' to have rlang in their imports.
#' This is intended for use by classes overriding Analysis
#' @param arg the argument to enquote
#' @return the quosure
#' @export
enquo <- rlang::enquo

And the way enquo() is defined in rlang has changed from:

> jmvcore::enquo
function (arg) 
{
    .Call(rlang_enquo, substitute(arg), parent.frame())
}
<bytecode: 0x7fc3523b86f8>
<environment: namespace:rlang>

to

> rlang::enquo
function (arg) 
{
    .Call(ffi_enquo, substitute(arg), parent.frame())
}
<bytecode: 0x7fc36a4d24a0>
<environment: namespace:rlang>

When installing jmvcore from a binary that can compiled against an older version of rlang we get an older version of rlang::enquo().