Double backslashes in examples render differently with 7.0.1

[wch]

I'm actually not sure if this is intentional or not. But in roxygen2 <= 7.0.0, given this input in the examples section:

#' "\\alpha" \\

It would produce this output:

"\\\\alpha" \\\\

In 7.0.1, it produces this:

"\\alpha" \\

Reprex (note that there are extra backslashes in the input for escaping):

library(roxygen2)
roc_proc_text(rd_roclet(), "
#' Example
#' @examples
#' \"\\\\alpha\" \\\\
f <- function() {}
")
#> $f.Rd
#> % Generated by roxygen2: do not edit by hand
#> % Please edit documentation in ./<text>
#> \name{f}
#> \alias{f}
#> \title{Example}
#> \usage{
#> f()
#> }
#> \description{
#> Example
#> }
#> \examples{
#> "\\alpha" \\
#> }

For a real-life example, the upgrade to 7.0.1 resulted in this change, which led to a R CMD check failure:

rstudio/shiny@0cbe4bb#diff-fd9eb6354a4cc65e5016dd2dd015e7d4R20

If this is the intended behavior, then that's fine; we can change the .R files to match.

[gaborcsardi]

Not intended. @hadley is aware of it, and I believe that there will be another patch version soon.

[hadley]

Now I see

library(roxygen2)

roc_proc_text(rd_roclet(), "
#' Example
#' @examples
#' \"\\\\alpha\" \\\\
f <- function() {}
")[[1]]$get_section("examples")
#> \examples{
#> "\\\\alpha" \\
#> }

^{Created on 2019-11-26 by the reprex package (v0.3.0)}